I was a little dissapointed with most of the current desktops floating around in preparation for Avengers: Age of Ultron, so I put one together myself. It contains the Guardians of the Galaxy, Ronan, The Twins, Ant-Man, Falcon, Vision, Iron Man, Captain America, Iron Patriot, Thor, Black Panther, Hulk, Hawkeye, Black Widow, Ultron, Winter Soldier, and the Masters of Evil (Abomination, Loki, Red Skull, and Mandarin). In case you think Iron Patriot will return to War Machine, I made a variant.
Enjoy! Make mine Marvel!