*cough*Minecraft server*cough* I bet their will be one with this if it is released.
Or it could be used for any regular RPG type game. Really though, the only thing that makes Minecraft's crafting what it is is the use of a grid and its broad variety of resources; otherwise, it's rudimentary (i.e: Basic MMO crafting)
But yes, someone should implement this into a mod. We could make it use different brick types, to form a shape, or something along those lines.