an old innertube or two can be artfully used to protect your bicycle frame from damage.
Step 1: Cut the Valve Out of Your Innertube
Step 2: Split the Inner Tube Down the Center
This makes a flat strip. thinner tubes are good because they are lighter and narrower
Step 3: Wrap Around the Frame
you probably should remove the brake and gear cables so as not to trap them.
Step 4: Cable Ties Are Good for Finishing at Both Ends
Step 5: Voila!
cool huh. this is excellent in preventing damage to your frame from using U-Locks to lock them up. also great to dress down your bicycle for urban environments.