Getting artsy with marbles! Saw this online while searching for interesting things to do with marbles.
Take some colorful finger paint and cover the marbles in the paint. Then place a white piece of paper on a cookie sheet. Once the marbles are placed on top of the paper, make the marbles roll around by tilting the cookie sheet. Voilà! You now have marble art! :)
I used to do this with pre-schoolers, it's a great way to teach about how certain colours mix together to make other colours. I love your picture Chris, it's bright and cheerful and very artistic in a random way. Great capture too, fave!