If you're having a hard time coming up with a craft for a boy's birthday party, this may do the trick. There are many different kinds of homemade play dough and silly putty that anyone from tykes to tweens can have a good time squishing and squashing around. Just let parents of guests know about the craft project beforehand -- that way, they'll be thoroughly warned in case of a play dough surprise in the car seat or a putty stain on the carpet.
Play dough recipes usually call for flour, oil, alum, water and salt. Simply mix together the dry ingredients and bring the water and salt to a boil. Once the water begins to boil, add the dry mixture and stir.
For silly putty, all you'll need is white glue and Borax. Mix the two ingredients together and, voila, you have a clump of bouncy, moldable silly putty. No heat or stove required.