We love this art + bike combo idea from American toy start-up Chalktrails. We found their cool video on the Kickstarter site, where the company is hoping to raise enough funds to start manufacturing the toys. Dubbed a great “artivity,” Chalktrails consists of a chalk-holding arm that easily attaches to the rear wheel of a bike or scooter. Riders create their own cool designs as they go, and the picture gets even bigger with more riders and more chalk. This art-by-the-mile approach looks like loads of fun. Bonus: no matter how far they go, riders can always find their way home. Check out their Kickstarter campaign.