One of my favorite t-shirts is this Barred Owl design from Threadless. It's called Owl Nebula and I just got an email newsletter telling me it will be on sale for just $10 tomorrow, November 24th.
Threadless shirts are designed by members; anyone registered with the site can vote on t-shirt concepts. I have a lot of favorites, like this one: Mechanic-owl King.
Night Grooves is another favorite owl t-shirt I purchased from Threadless.
Owltical Illusion looks great but I haven't purchased it yet myself.
Besides Threadless I have some awesome owl shirts from Birdorable in my closet, too. Owls are Cool is my absolute favorite. There are currently nine owl species on Birdorable so check them out to see if your favorite species is there.
This fun Snowy Owl face t-shirt is a best-seller around Halloween each year.
This week's highlighted shirt design is called Extinction is Forever. Spread conservation awareness with this design that shows a different extinct bird within each letter of FOREVER. You'll find images of the Dodo, Passenger Pigeon, Ivory-billed Woodpecker, Labrador Duck, Carolina Parakeet, Rodrigues Rail, and New Zealand Bittern. The design is shown here on a men's baseball t-shirt.