When I provide candy at a party, I prefer to offer individually wrapped selections. Unwrapped candies can be a breeding ground for bacteria. Such offerings as nuts and chips are safer, as the salt they're coated with is a natural germicide.
Hmm Something that doesn't leave residue on your hands (like color from the candy)- I would suggest eating something like Starburst. Something you can easily pop in your mouth, and not hold in your hand for a while. :D