Ohdeedoh has a great round up of art materials that can be made at home. I posted this on my Facebook page but thought it worth mentioning here too – check it out!
I’m a big fan of homemade playdoh, we’ve had great luck with it and I often dye it with our liquid watercolors. Below is one of my favorite playdoh creations. On our last camping trip the kids gathered bits of grass and leaves and created little playdoh people. What fun!