CBS hired artist Juan Ortiz to create 80 Star Trek TOS posters, in a retro style. They are releasing them monthly at Star Trek.com (links to first batch of posters, released August, 2012).
From October's batch:
Not my favorite episode, but I love Ortiz's Dr. Suessish treatment of "The Trouble with Tribbles"!
See all of them (for sale) at Quantum Mechanix.
UPDATE: In September 2013, the posters will be available as a book, Star Trek: The Art of Juan Ortiz (links to Amazon).