Source says you can buy at Pottery Barn for about 50 bucks (gasp!) or make her Ikea conversion for about 15!! At that price you could make two! ... About 8 bucks for the lazy susan and a buck a piece for the pails. The pails are just glued down - you could use a drill with a round cutter (like for a door knob) if you wanted to get real crafty. Source shows a full tutorial. Another idea would be to glue smaller containers for painting or chocolate "painting".... Enjoy!
Another idea... what if you did a stand like this for the cake or cupcakes you'll serve! Would even be cute if you made a box or bin covered in crayons that held art supplies on your table! I would just recommend gluing a piece of felt to the bottom to ensure there are no crayon tracks created by accident!
Source 1, Source 2
This was too much fun not to mention... Every kid (and adult) loves a moonbounce! Why not try and see if you can rent this model from one of your local party rental places! Because some kids might come to the party without socks on - maybe do a gift bag or set out a basket filled with different solid colored socks. How fun would it be to get a picture of all the kids feet lined up wearing a pair of different colored socks! Source
Previous post with more ideas... http://frostmeblog.blogspot.com/2009/11/art-party.html