Who doesn't like to make their own stickers? You can choose glue or gelatin for your base, but we opted for strawberry gelatin. Make any sort of 'lick 'em' stickers that you like!
There are three different options for the sticker adhesive. We opted for the flavored gelatin and water mix. Alternatively, you could use plain gelatin and vinegar, or white glue and vinegar. Of course we went for the one that would taste the best!
Then we applied a double coat of adhesive to the back of the papers and let them dry thoroughly. Light paper will curl, so you can just flatten it with a book when thoroughly dry; we used heavy paper, and they didn't curl at all. To use the stickers, just lick the backs and stick them on whatever you like.