Minutes ago, a new post went up on the Team Fortress 2 blog, calling for T-Shirt designs for future merchandise. Enterprising artists are encouraged to upload their compositions to theSteam Workshop for all to see and vote on. Already there are over a dozen designs available to check out! My personal favorite is this shirt starring Archimedes.
Along with the fact that the Workshop submission for the recently-added Spycrab misc.mentions an upcoming plush tie-in, we can assuredly look forward to some high-quality community-created products for sale in the real world, to go with the hundreds already available in Team Fortress 2.