Does anyone know how to color frosting like this or what you need to do to get it like this? Thanks

if you mean the rainbow effect, you colour each frosting in a separate bowl and add it to your piping bag one colour at a time.I put in a little of each colour in layers in the bag and then keep layering until your bag is halfway full.

Just skip the plastic glitter!

Pretty is probably the wrong word, unchanged is probably closer to the mark. 

An easy way to get all those colors in the bag, might be using the buttercream plug method. Lay a piece of Saran Wrap on the counter, add your color in thin layers either side by side or on top of one another. Fold up the Saran into a tube, and twist the ends tight, slip into your piping bag threading through your tip. Snip the excess Saran Wrap at the end, and there you go. Much easier than trying to get all the stripes into the bag evenly. And if you have to reload your bag, less mess and chance of the colors blending, just start with a new piece of Saran Wrap and repeat.

Here's a video that shows Jemchina's technique. http://www.youtube.com/watch?feature=player_embedded&v=QxE-pnqmsE0

I use the icing plug exclusively when I pipe.  Any left over icing can be placed in a baggie, sealed and placed in the freezer until you need it again.  Love this method.