It is a very simple material, but the challenge of manipulating clothes pins adds up to the color identification/naming, so it really keeps the attention of little ones absorbed for a while.
All you need to do is divide a card stock circle into as many wedges as you want (I started with 8, but it can be simpler, with just 4, or more complex)
Choose the colors you want to use. This wheel is done with primary and secondary colors + black and white, but you can also experiment with monochromatic.
Paint the wedges and the sides of the clothes pins. (you can also use construction paper and glue)