My cousin told me about these thumb print trees that people are doing for their weddings. Instead of a regular guest book for the wedding people can get a little more creative.
Everyone gets to use different colors, if so desired and adds their thumb print or other finger, creating leaves for the tree and signs their name to their print.
I designed hers with a bit more detail than I had seen in others. I hide some faces in the trees trunk and branches, and some heart shapes here and there.