My old friend Dan Durda is a phenomenal space artist. His digital pieces are incredible. Last year, he put a dozen of them together to create a 2012 space calendar he called "All these Worlds...".
If you're looking for an early holiday gift, you're in luck: he's done it again this year, making a new "All These Worlds 2013". Here's the cover:
I know, right? More of his artwork is linked in the Related Posts below, and you can go see his prints for sale, too. So go buy one already!