I know that you can easily make any image your desktop wallpaper, but it's nice to sometimes find art that is specifically made for that purpose.
The A's just released the above wallpaper image, which you can find on their website here. They've used a similar image many times this year, on everything from pocket schedules, game-day giveaways, and giant banners hanging from the side of the Coliseum.
Here's a full-version of the logo that the A's created for Rickey's Hall of Fame induction, which could also easily be used as wallpaper. When I first noticed this logo, I commented on the fact that I couldn't find a full uncropped version anywhere. Thanks to a comment from a fellow collector, and an e-mail to the A's media department, they very quickly send me over the full image.