Last year's painting on a sphere project was so fun I had to do it again (with a few tweaks). This year while we did mix it up a little, we kept the basics the same. Last year we used cardboard, this year a large sheet of foam core cut into six inch squares worked as our base. Instead of a waxy ball we used a flat bottomed wooden sphere from the craft store. I glue the spheres down ahead of time and set each bit up on a sheet of wax paper in a tray that had an edge (such as a cookie sheet) as the kiddos love to squeeze as much paint as they possibly can.
Tacky Glue). Place base and item on top of a sheet of wax paper in a tray. Fill your bottles only half way (kiddos will squeeze as much as they have) and try for colors that will mix well together such as blue, yellow, and green. Once you set it all up call your kiddo to the table, grab a camera and let the fun begin.