Stacked lids, bottle tops and caps. Fun for kids, but would also make great garden art! I'd think the trick for doing this project is to collect as much different color, shape & size of lid/caps as possible before start putting them together.
Q-Tips. Pointillism, grade, Dots upon dots, circles upon circles, maybe do color families . I like the idea of breaking this into sections for each child to complete and then putting the whole thing back together (LS)