I know that when you make a petal cake all in the same color, you put a vertical row of dots of frosting, then press and "smear", for lack of a better way to say it! Here's my question: When you do the ombre effect, do you still pipe out a vertical row of dots, just using a different bag/color for each dot, or is there and easier way and I'm just not seeing it? I can't think of a way you could do your one color around in a circle, then move to the next color. Does any of this make sense the way I've explained it?

I was under the impression that you added the glue and flowers going around the cake to make a layer and then you would move on to the next layer by spacing it a bit so the petals overlap slightly. Maybe we are thinking of different petal cakes?

Here is a link to a tutorial. I have used it before to make a petal cake. I just kept adding white to lighten the fondant for the next row.
http://cakecentral.com/tutorial/petal-cake
Hope this is what your looking for.

Yes, I'm sorry, I wasn't very clear in my description. I don't mean fondant petals, I mean the petal effect, with large dots of buttercream that are piped on the cake in a vertical column and then you go back with a small spatula and press into the frosting dots and pull them out. Then you add another vertical row on top of the flattened portion and pull it out again with the spatula, and so on until the whole cake is covered. I'm just wondering how you do it when you use 4 or 5 different colors in an ombre style.
Anybody?

Okay, here is a link to the petal effect I'm talking about. Actually, I think the woman in the video just answered my question; you do have multiple bags of different colored frosting and pipe one dot at a time.
Sorry for the confusion, and thank you for attempting to help me. I appreciate it!

Hey there, I did a green ombre cake just recently (its in my gallery). I did one colour layer at a time working around the cake. When the bottom layer was finished I added white to my icing and did the next layer and just kept repeating. HTH

Thanks, Katherine, that does help. Your cake is pretty!

i've done a single color dark to light. i started out with a small amount of dark blue icing and iced 2 horizontal rows starting at the bottom. i then squirted all the icing out of my bag, and added a little white icing to slightly lighten the color, mixed it up, re-bagged it. then i piped 2 more rows. repeat all the way up!