How many do you need, how much can you spend, and what's the age range? Do some prizes need to be bigger or better than others? Or is it a cash in your tickets situation? Are the kids and parents attending likely to be like-minded as far as "green" goes?
We were thinking of letting kids cash in their winning tickets for things like face painting, nail painting, tamp tattoos, glitter tattoos, and hair chalking. Those are some of the most popular things at our carnival. Baked goods are also popular.