I wanted to write a skill that my two year old son would enjoy. He is learning is colors. He likes to make decisions, and see the result of his decisions. I thought for him to be able to choose from a wide variety of colors, and then see the buttons act in those colors, would be a huge delight for him. I decided to use the colors as defined by a popular crayon provider to choose labels for 120 colors. I use two echo buttons, so he has another choice to pick which one to hit and have one for each hand, or one he could share with his sister.