Uncle Elliot and Aunt Gloria got Theo these magic fingerpaints for Christmas, where the color only shows up on this magic paper. Is that mom friendly or what? Incidentally, he's also wearing the pajamas they got him.
Theo was good about using one color at at time 'til he said screw it and mixed all the colors together, making some weird purple. This is exactly the way it goes with play-doh, too.