I like this one because all of my kids can do this. Don't want them sucking up anything, but this one prevents that by putting the ink/paint on the paper/canvas and blowing! Nice :) "India Ink Art For Kids - Monochromatic homemade abstracts-- love this idea!"
milk & food coloring - take a q-tip and dip one end in dish detergent and lightly touch it to the milk and this happens! cool science project for kids and adults! Dip a piece of paper on top for tyedye painting