Finally, we went to Target and I picked up a little craft set that included stuff like pipe cleaners and beads. This actually went better than expected. The girls decided on their own that they'd make bracelets for themselves. There were a few fights over beads and such, but it mostly went well. It did hurt a little when they started mixing colors and shapes without any sort of pattern. That's just me being crazy though.
I'm going to continue to try getting these guys to make some sort of craft project. Suggestions would be appreciated. Hubs thought that possibly getting them a little table, so that they don't have to work on the floor or kitchen counter might help. I'll have to see if I can find something. I also bought some materials to display their art, so maybe that will encourage them as well.