OK, not for the bike, but a recycled bike part ... over the weekend I built a critter box -- like a birdhouse, but bigger, for squirrels or whatever wants to move in.
Needed to mount in in a tree out back. Couldn't nail it to the tree, so I wrapped an old bike chain around the trunk and nailed the chain to two sides of the critter box.
Used old auto license plates for the roof of the box, which I made out of scrap wood. Even used recycled nails!