I tweeted that if they released official prints of the Gnomeregan propaganda poster, I'd buy one. I'd like to thank Blizzard, because they are now offering a large selection of original posters through Printwarcraft.com. Selections include the Gnomeregan and Echo Isles propaganda posters, as well as artwork from many past major patches and in-game events, even as far back as the Gates of Ahn'Qiraj and the Shadow of the Necropolis.
Most of the art is actually familiar, having appeared on various websites and art books long ago, but it's still pretty awesome stuff, and more than worth hanging on a wall. If your home or office has some bare walls, this might be a good excuse to fill them. You can check at the selection at PrintWarcraft.com.