Color flow is used to to make outlines and fill in patterns. Example trace onto a small card board then cove tight with wax paper or parchment paper. Using parchment triangles with the color flow outline what ever it is that you drew onto the board. Example wilton teaches a bird. Its outlined in plain white color flow. The inside of the bird is blue you add color to it the way you would icing just a little at a time with a toothpick. I dont think I used a tip but just the parchment. Wilton sales it follow the instructions that are included. After you fill in with the colors that you want make sure its kept in a dry place. I have had my color flow bird for almost 6 months havent used it yet. It fun to do. Hope this helps a little also go to wilton site I think they may have instructions for it as well. MC
I love decorating w/ color flow! It's my favorite icing to use to decorate! A lot of the cakes in my galleries have color flow pieces on them. Take a look & if I can help you w/ anything I'd be happy to~ Color Flow has a high shine to it. I think that's why I like it so much. Try it you'll love it!
I am confused too!! So colour flow is a type of icing? Is it like piping gel or a BCT??? Sorrry this sounds dumb... i have no clue..
Please...someone enlighten me!!
Click on this link for some helpful instructions:
http://www.michaels.com/art/online/displayArticle?articleNum=ae0257
ThePastryDiva had posted that Marshmallow Fluff can be used in place of color flow but I don't know the details!
..ooh, ooh...here is some info about using the Marshmallow Cream in place of color flow:
Recipe via Meal-Master (tm) v8.02
Title: WILTON MARSHMALLOW CREAM FLOW-IN
Categories: Desserts, Cakes, Frostings, Wilton
Yield: 1 batch
1 Jar marshmallow cream for
-each color desired
Icing color
This stays very shiny and is easy to cut through. These
decorations will not dry hard as Wilton color-flow & must be
done directly on the cake or cookie. CAUTION - Marshmallow
cream will be VERY HOT.
TO PREPARE MARSHMALLOW CREAM -
Pan Method: Place about 1 1/2" water in a large skillet or
electric pan. Depending upon design, set up to four jars of
marshmallow cream (one for each color) into pan and bring water
to a boil. For faster heating, fill jars only halfway. Add
icing color as the cream softens, stir until color is well
blended. Let simmer, then stir until cream is smooth. Leave
jars in water while you decorate.
Microwave Method: Place the desired amount of marshmallow
cream in a bowl. Add desired past color. Microwave on high
power for about 10 to 12 seconds, then stir. If not softened
(the total time depends on quantity being heated) microwave
again for 7 to 8 seconds more. After heating, stir until color
is completely blended.
TO DECORATE: Trace pattern on cake with a toothpick. Outline
design with stiffened buttercream or royal icing (royal is
preferred as the heat of the marshmallow cream may soften
buttercream) and tip 3. Let outlines dry for 10 minutes or
more. Cut a very small opening in the end of a parchment
bag and fill with marshmallow cream. "Flow-in" by filling in
along the edges of the outline first, squeezing gently and
letting the icing flow up to the outline almost by itself. Work
quickly; filling in design from the outside edges in and from
top to bottom. If you're working with a large area, have 2
parchment bags ready so it won't set up before you're done. If
the marshmallow starts cooling and won't flow smoothly, simply
microwave bags for about 7 to 8 seconds on high power. Any
remaining cream can be stored in a jar & reused by microwaving
for 8-9 seconds until soft.
Color Flow is a powdered mix that Wilton sells, not sure if anyone else sells it?? You mix the color flow with powdered sugar and water to make an icing mixture, following the instructions on the can. After mixing the ingredients it comes out lke stiff royal icing. I use it to make decorations for my cakes. I find a picture I like, tape the picture on a hard surface (cake board) then place wax paper over that (wax paper needs to be taped down as well very tightly so you have a smooth surface to work with. Then you take your stiff color flow icing and using a tip (I use a tip 3) I outline the picture making sure to be careful that the outline is seamless. Tip - if you need to blend your outline lines together use a dampened paint brush to blend the lines together. You thin down your color flow icing with water to get a 10 count consistency. This means that if you put your spoon in the bowl and then remove the spoon the mark left by the spoon will disapear by the count of 10. You then place your color flow in a bag (I don't use a tip and just cut a small hole in the bottom of the bag) and fill in your outlined design with your color flow icing. Forgot to add you can color this icing just like you would royal or buttercream. After you have completed filling in your picture you then let it dry for a couple of days. Once dry you can remove it from the wax paper and you have a color flow decoration to place on your cake. The possibilities are endless. You can use any picture you want. I am sure I missed something!! I hope you have a better understanding of color flow. 
Thena
In the pict gallery there should be some peoples wilton class 2 cakes. they have a pickett (sp) fence that stands up on the cake. That is made with colour flow. it is basically your frozen buttercream transfer but you make it with royal icing. You pipe the outline in royal icing then thin the same colour down so it is pretty runny. You use the thin stuff to fill in the pattern. Wilton sells colour flow mix, since this mix is just meringue powder I am pretty sure royal icing is the same thing!!! (just trying to sell you more wilton stuff I think)
your colour flow pieces dry hard thats why you can stick them upright on the cake. Beware that over time (24 hours or so) the piece of colour flow that was stuck into the buttercream will dissolve, so dont do it too far in advance. We did a butterfly in our class. I took it off the cake and kept it. I guess it will keep forever!
Have read this in one of my Wilton Yearbooks but have not tried it yet...sounds interesting.
I like doing my color flow to "puff up" kind of like a pillow if this makes any sense. It flattens a little as it dries, but is still thick. Make sure you also do a test dot. Beside of your pattern, put a dot of colorflow about the same thickness as your pattern. This way, you can test your dot to make sure it's dry and not worry about messing up your designs. The color flow pieces usually come up pretty easily by running your spatula under them. But, do make more than one, because they will break! You can do any kind of pattern in color flow, draw your own, use a page from a coloring book, etc. Just have FUN!!! 
I've never tasted it, it gets REALLY hard. My kids say it just tastes like hard candy.
I have never used it byitself, like to put on a cake. I have used it to decorate cookies with, and it doesn't get overly hard on those. The taste is *similar* to royal icing, but takes a LOT longer to dry. I like it for marbling on the cookies. This is a pic of some cookies I made for my daughter's pool party a few years ago.
It is hard to see the marbling in this pic, but they came out really cute.
Is this the same type of icing people use to decorate their sugar cookies with? If not, what type of icing is that...they alway look so smooth, and detailed. With the holiday's coming up...would love to know how to do this. Thanks
I've used Royal Icing to decorate my cookies. Antonia74 wrote a great article on how to bake and decorate cookies. She has a picture next to each of her directions. It's a great article. Here's the link to it:
http://www.cakecentral.com/article54-How-To-Bake--Decorate-Cookies.html
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