Original Post
I was playing with the source sdk and its associated tutorial in C++, and thought a version of minecraft made in source would be neat. Basically it would be a source sdk game made in the c++ mode with no terrain file and a lot of cube models, possibly with dynamic or non-dynamic textures. Each cube would have custom code to mimic minecraft and/or make it a 'realistic' terrain sculptable game. The cube models should be pretty easy to make in hammer via the tutorials and forums, and the models should clip automatically, then you can load in melee weapons and guns from other 3d steam source games like counter strike and half life or make your own similar models, with working gun code and whatnot that's all moddable and easily sold on steam.