You can download high-res images of nebulae via the Hubble Site! HOW COOL IS THAT?! I'm definitely getting a poster (or three) printed, regardless of the fact that I'll be homeless in two months. Thanks to Michelle Armas for blogging about this!
Top to bottom: Horsehead Nebula, The Carina Nebula: Star Birth in the Extreme (is that not an epic title, or what?), and Close-Up of Helix Nebula. (If the universe doesn't blow your mind, I don't know what will.)