It's hard to believe that a decade has elapsed since the birth of Threadless, the wildly popular t-shirt company with an ongoing, open call for design submissions. They're celebrating with the Threadless Everywhere Tour, a three-month, cross-country whirl of art parties, craft fairs, and community meetups that kicked off yesterday in San Francisco. Look for the company's distinctive Airstream trailer/art studio and spray-painted van tooling around your town or rally a Facebook group to convince them to stop by on the tour's third crowdsourced leg. Expect graphically intense birthday cake and plenty of t-shirts, including relaunched versions of some favorite designs from the last ten years.