I've found a fun new website it's called Growing a Jeweled Rose. I do NOT love messy projects, but I have the feeling that they may be good for Primo. To be honest I'm looking for some fun stuff to fill the days when there's no play school and the weather is so gorgeous right now it would be great to try these things outside. The site is so fun and messy, I've already made the colored rice, although we haven't played with it yet. I remember how much my older kids loved playing with shaving cream and slime, there are some great recipes for these too, imagine shaving cream studded with pop rocks!
What fun sensory stuff do you do with your kids?