Entertain the kiddies

Ah, Monday. This weekend wasn't nearly long enough. My daughter had dress rehearsal for her dance classes, which took up our entire Saturday. Next week is the recital, which will also take up an entire Saturday. the teachers at the studio ask the parents to bring something for the kids to do while they aren't dancing. There aren't any televisions in the dancers' waiting area so we're kinda left to our own devices. (I volunteer to help backstage.) I generally bring coloring books and crayons. I think last year I brought those magic pen books where the ink 'magically' shows up when you use the pen. Other than that, I'm out of ideas for inexpensive and clean ways to entertain the kids. We're talking about kids aged 7 to about 10. Ideas gladly accepted!