What I've been doing with my kiddies at work...
Experimenting with color
Yellow, green, red, and blue food coloring put in ice cube trays and frozen
Excellent teaching aid for learning about primary colors and mixing colors...
Place two ice cubes in a plastic baggy and let children
rub the cubes together until they melt to make new colors.
Blue + Yellow = Green
Red + Yellow = Orange
Blue + Red = Purple
Getting ready for take off!
Paper and tape to cover canister
For directions see here.