Another point requiring clarification:
While there is a certain overlap, "Sci-Fi" in this context does not cover Weird Wars (there's a different board for that, with a different Painting Club to come in the future) or Postapocalyptic themes (there already was a Painting Club for that).
Some exceptions may be made for some items from post-apocalyptic settings if they are clearly of the Science-Fiction variety, such as suitably-futuristic robots (e.g. Claptrap above, or the various robots from the Fallout franchise), but the mere fact that a post-apocalyptic setting takes place in the future doesn't make it Sci-Fi per se.
As for Weird Wars, that theme will get its own Painting Club in 2015.