I've done tie-dye with little ones and big ones. It's fun! I suggest a kit from Dharma Trading. As for what do do in advance, I suggest mixing the dye and pre-soaking in the soda ash solution the shirts the night before. I know you were thinking of tieing the shirts the night before but it doesn't take much for the kids to do it themselves and they really love it. I usually let them tie them how the want, scrunched up or try to "guide" them with their ties.
4/25/10 at 10:58pm