The one on top was given away to everyone who participated in the main tournament at the Darkmoon Faire events, and the one on the bottom features art by none other than Gabe of Penny Arcade. Oh, and you can't see it in the picture, but both mats are signed by none other than Mike Hummel, head of Upper Deck's R&D, and co-creator of the WoW TCG.
To enter, just leave a comment (one comment and only one comment) on this post right here. As usual, the contest is only open to US residents age 13 and up (rest of the official rules here). Tomorrow morning at 11am EST, I'll close the comments and we'll choose two at random to each receive one playmat each. Good luck, comment away!
Update: Contest over, comments closed. Thanks for entering everyone-- check your email to see if you won.