Don't hack you Gamerscore. I did it. Got caught. And it sucks.
Forge, in which you, instead of using blocks to form structures, you should be able to use a blank canvas, like a white box. You should be able to form canyons, waterfalls, creat your own buildings, rivers, lakes, birds, grass, trees all the neat stuff, what bungie does basically. It's taking forge to the next level... I would call in Anvil, not Forge.