Here are a couple Hiwheels, which were made into garden decorations/planters, from the company Rideable Bicycle Replicas. I think it's a cute idea, but I also think it would look better if the bike had some patina to it-- not so new and fresh. However, I would always be tempted to hop on the bike and ride it around the yard :P My argument would be, "I'm just helping to give the plants an equal distribution of sunlight," hehehehe.