Florida maker Daniel Fleischman designs and builds pedal-powered vehicles using PVC tubing for his company American Speedster. On his site you'll find plans and component kits available for a small fee. Pedal-powered vehicles are becoming increasingly popular. Some folks are even hot-rodding them with electric conversions.
Make: Projects - Permanently stain PVC pipe any color you want"-- will do this to the rungs on my agility ladder and to the hurdles I made, too. Be careful of toxicity and wear gloves and respirator when applying.