We participated in the "Unplugged Project" last week. The theme was 'science'. Our neighbour came over with her daughter and we did a little twist on the old baking soda and vinegar experiment.
We mixed vinegar with food colour, a little bit of dish soap, glitter, and of course, the baking soda. The dish sap caused a volcano-like reaction that was really cool to watch. The glitter was a bit small and unnoticeable, but the colours were great, and the kids had tons of fun mixing and pouring once the reactions had petered out.
Lindsay has tons of pictures and even a little video of the kiddos in this post.