the little red riding hood ride ( all womens breast raising funds for breast cancer, supported by males dressed as wolves) in Utah last year awarded each finisher with a bracelet made of bike chain, and "oh my how conviently" had a booth selling charms ( some theme related to the ride and some just nice ribbons for various causes etc.) just next to the finish area. It's a fun reminder of a great ride for a good cause .

It sounds like an excellent idea.