Many people have described the popular freeform game Minecraft as "kind of like Lego", so a few enterprising stop-motion animators have decided to jump on that idea.
Cogitate - Manipulate LEGO TECHNIC gears, beams, conveyor belts and motors to complete the ten pre-built puzzles or create your own levels. [In my case - Then watch them crash in a heap when you test them.]
Bitflicks : very large and accurate representations of video games made out of Lego blocks.
Lego Worldbuilder 2 An enjoyable and challenging sequel to the Lego Worldbuilder. Mefi post about the original