Some activities need the gross gucky stuff, but the problem is what to do with that kiddie pool full of Jell-O and oatmeal after you've had your fun. A good alternative is peat moss. Just add water and you have instant mud! It's cheap and enviro friendly. The stuff looks gross and formidable, but the beauty of it is that you can get dirty and then simply spread it around on the lawn after you're done. (Don't spread it around on a gym floor after you're done, as there is little need for that kind of thing) We discovered that marshmallows can survive in a peat moss soup and they don't taste that bad either!