I wanted to share a project I did last summer that is just now coming out. While it is not a video game, it is a board game and ZBrush was my main weapon.
It is the Curious George Discovery Beach Game.
I was responsible for creating dozens of sculpts for the game pieces. Please note that all of these are oversized and are actaully created at about 1/2 inch.
I built simple base meshes in Maya and then worked out the details in ZB. Always mindful of production undercuts.