This falls squarely into the "Why didn't I think of this?" category. This mom put some kids' paint in a Ziploc baggie, sealed it, taped it to a glass door and let the kids play around with completely mess-free finger "painting".
Toddler Art Project, You could use Nature of Art's non-toxic VOC free paints for this project. Special Pinterest deal, 5-4oz acrylic paint starter kit for 16.99 (shipping not included). Use code ms-acrylic-4/13, good for 1 set only, not good with any other coupons. Check out our other eco-friendly, non-toxic art supplies for kids on our website.