Add polka dots to an Easter egg using a pencil eraser dipped in paint.
Drop vinegar tinted with food coloring onto a pan filled with baking soda. Sheer minutes of colorful fizzy fun! Looks so fun!
DIY Rainbow Bubble Snakes for Kids
How to teach colors to a toddler: "I read this article, changed my method, and was amazed when a week later my 18 mo. old knew his colors backward and forward. Even if you're not trying to teach colors, read this article from Scientific American, its fascinating!"