I found a tutorial here to make colored pasta for my son's preschool. I also made Homemade Play Dough to add to the list of things to donate.
15-20 Drops Food Coloring
1 Teaspoon Vinegar
Put 1 teaspoon of vinegar into the ziplock bag
Add 15-20 drops of food coloring
Add 3/4 cups of uncooked pasta into bag. You know how you always try to push all the air out when sealing a ziplock bag? Well, you want as much air as possible so you can shake things up!
Wait 10 minutes and SHAKE IT again (do a dance with it if you're in the mood lol)
Place on wax paper (I put it on a cookie sheet too) to dry.