I have set my rainbow in the clouds, and it will be the sign of the covenant between me and the earth. - Genesis 9:13
I don't remember where I first saw instructions on making rainbow pasta, but here's a link on how to prepare colored pasta.
The kids loved this project. They were fascinated by the whole dying process and the rainbow of colors. Not only was it good for developing fine motor skills (it's not easy working with little macaroni curls!), but a good way of teaching kids their colors. And because of those two reasons, it fit a nice age range so that both Calvin and Charissa enjoyed making this.
I was surprised at how well Calvin's turned out. Charissa was more interested in squeezing out the glue, but I did manage to review colors with her. In the end, I tried making some pasta jewelry. Definitely something the kids would enjoy when they get a little older simply because the macaroni is small and requires more skill. If you had colored penne or rigatoni, it would be a fun craft for younger kids!