I did a fun (and easy!) activity with the kids that I thought I would share. We are teaching Ben his colors (he can't seem to keep a couple of them straight) so we used colored water to help us do that. I put out 6 clear glasses. The first glass we had red water. Second glass empty. Third glass yellow water. Fourth glass empty. Fifth glass blue water. Last glass empty. 
It's the whole color mixing thing. We took the red water and yellow water and poured some into the empty glass between the two to make orange water. We did the same with yellow and blue making green, and blue and red making purple. The kids loved it and all wanted to try it for themselves. We're going to do it again when it is warmer outside and we can let them experiment for themselves with medicine droppers or something. Anything with colored water is a treat! :) 
I also found this idea on a great crafting blog here. If you go to the link it will show you step by step how to make these dolls. It was very easy and Elizabeth is loving to wear hers. I thought they would make great add-ons to girl gifts. So if you have a girl, close your eyes! You might be getting one :)
(please ignore the stain on her shirt :)
Ben wanted one too, but he refuses to wear it around his neck. So he just carries is around. I am thinking of how to paint the dolls to make them look like firemen, doctors, policemen, etc... Not that Ben can't have a girl doll, but I know he would also like the others, so would Elizabeth for that matter! If I come up with something I'll post it. But for about 4$ I made all those dolls - not too bad!