Bioshock 2's senior character designer Colin Fix has put up some fantastic concept art for the upcoming PC/PS3/Xbox 360 game, like this piece of Big Sister and the Big Daddy Doll, which toy/comic/gaming blog Super Punch has posted as downloadable wallpapers.

Colin notes that his wife, Annie Fix, also did a lot of the character designs for the game: "Pretty much all the design work on the game that involved little sisters was done by her. She brought just the right sensitive feminine touch to these freaky little sweethearts." You can see more examples of their work below: