From Fedora Project Wiki

Over years there have been lots of designs for t-shirts.
At this place we're preparing, collecting and categorizing them to give you a database of high quality, print ready artwork. If you have something which is missing here, just go ahead and drop it in. (Maybe having a look at the guidelines before would be a good idea. Just to make it easier for you and us.)

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Regional Releases
Country-specific shirts with maps or native language With every release of Fedora there is new artwork
Get... Get...
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Events Motivational
A lot of events around the globe have their own shirts. Shirts with no specific printing, just pure Fedora-related artwork
Get... Get...