Sony has posted over on the EU PS Blog some concept art showing how LittleBigPlanet's Sackboy evolved from being a walking yellow and pink square to lovable fella he is today.
Through the second link there, you'll find and interview with MM's Kareem Ettouney and Francis Pang who revealed how when LBP was pitched to Sony, her was nothing more than "debug programmer art called YellowHead".
There's also a video, which we've posted below, showing a concept reel of various Sackboy deaths. Poor little bugger.
LBP2 is in closed beta at the moment, and currently slated for release in January, and it was announced today Europe would be getting a Collector's Edition.