Found this combing thru twitter today. While I have yet to se the movie, Pacific Rim, they have a web app on their homepage that will allow you to design your own Jeager (thier name for the giant fighting robots in the film). The program allows you to choose from a (very) small subset of robot pieces, then colour them and arrange them in various scenes. Is kinda cool, though a bit limiting. Would be nice if you could download the 3D models of these things as well. Was a fun way to end the evening after dealing with my teething son.
You can find the Jeager designer at http://apps.warnerbros.com/pacificrim/designer/us/