This thimble is from Space World and features the "official STS-121 space shuttle mission emblem," with the names of the seven astronauts from that mission: Mark E. Kelly, Stephanie D. Wilson, Piers J. Sellers, Thomas Reiter, Michael E. Fossum, Lisa M. Nowak, and Steven W. Lindsey. Space World has all kinds of space exploration collectibles. The thimble shown is $4.99, no extra charge for S/H.
There are other thimbles for sale, that may be similar but do not have pictures, such as: