At I Can Teach My Child, she used paint chips to create a fan to help teach her child his colors. I worked with that idea and made a paint chip key ring for my daughter to use to learn her colors and match them with colors in books we read. Lowe's Home Improvement Valspar paint has one color paint chip squares that are perfect for this. We picked out chips that corresponded to the colors of the rainbow as well as grey, black and brown. Punch a hole in the center of the bottom and thread them on a keychain.