I got this idea from here. I had to buy the template, and then I made copies onto cardstock. The children were instructed to have someone else at their table draw around their hand lightly in pencil. Then, with colored pencils, they colored in the hand using only warm colors, specifically red, orang, and yellow.
We talked about complimentary and contrasting colors, and I had a picture of the colorwheel on the board for them to use as a reference.
After they colored the hand, they started on the outer rings, making sure to match up colors, like on the color wheel: orange to blue, red to green, and yellow to purple.
They turned out looking great, and it was a fairly easy project.