want to try something cool? color some water with food coloring–3 or 4 colors is good. take a piece of wax paper, lay it over a white sheet of paper. sprinkle about 10 drops of colored water onto the wax paper. use a straw to blow your dots around. put the whole set up in a baking sheet if you’re worried about mess.
add some instrumental music in the background, and you’ll be there for hours.