Mario & Master Chief possible in LittleBigPlanet

You may recall a while back when Sony released a few concept pics of
LittleBigPlanet, specifically their character creation sketches, that drawings of Mario, Master Chief, and Katamari were included. Many people thought this was cute and/or funny, but not entirely possible. Creative director Mark Healey assures us that, while concept art, "
...you can customise your character so much that that's entirely possible." This is done by importing "stickers" from your hard drive -- something we don't quite understand, but are entirely sure it's straightforward to do once you try for about ten minutes.
Sony will leave it mostly up to the community to report and moderate dodgy comment. Healey cedes that "the first thing I'd do is make a big c*** and publish it, but clearly we can't allow that." Someone will, Healey, someone will. But it'll be up to us to lay the ban hammer on them and keep our LittleBigPlanet clean and habitable. Either way, we can't wait to see Mario teaming up with the Master Chief alongside, say, a Helghast in order to make it through a level in LBP.