Recently I picked up some play doh for Cormac and his little friends to play with. I would say it's a childhood staple here in the US. It's cheap, keeps the kids occupied, gets their little hands and imaginations working. I really enjoyed watching the five 2 year olds play with it this week.
Later that day Mac insisted on playing with it again (and has for the past 3 days). When Jim came home, he started reading the ingredients and was surprised that there was wheat in it. Actually he was shocked. I did know that, but didn't think about it when I bought it, because Mac nor any of his friends have a wheat or gluten allergy.
There are a ton of home made play doh recipes out there you can make. Just do a goggle search to find one that fits your needs. Here's a page of links for the search I did for wheat free play doh recipes.
I'm sure parents of kids with wheat or gluten allergies know this, but I wanted to put it out there for all parents who have play dates. Just something to think about.