How to keep a child busy for hours in the summer: DIY: Giant Ice Cube Awesomeness - filled with plastic animals, dinos, and such. And I'm sure you could put in food dye before its frozen to color it like the ice block in the photo.
How to Make Rainbow Pasta- Add food coloring to individual pots of boiling water. Boil pasta in food colored water. Cook pasta as directed, drain and rinse separately. Toss and get ready to swirl - birthday pasta