Painting with toy cars is always a hit with my 3 year old twin boys. It is a simple activity to set up and clean up afterwards. I usually use washable tempura paints. Sometimes I will add some washable glitter paint also to make things more interesting. I use masking tape to tape the paper to the table. The paper usually ends up being ripped at the end because my boys like to go crazy with their cars but it’s the process not the product that is important.