(House built on the 12-7-2012)
My new house. I mined into a mountain and dug out a 10x10 room and filled the walls with wood and making it 9x9. For the roof and floor I decide to use logs (which when using stone tools takes ages). I needed about three stacks of logs to finish the whole room. At each side, in the middle I carved in a 3x2 hole for my chests. But because it wasn't even, at one side I placed a Crafting Bench and at the other a Furnace (across from each other). Near the door I placed a stair and two Wooden Slabs. Then I thought i'd be needing more furnaces so I placed two one space away from the slabs on either side. Directly adjacent to them I placed beds. Next to the left bed (As if you where looking from the door) I placed a Jukebox and the right bed I placed an Enchanting Table. And finally, in the middle I carved out a 3x1 hole dug severn block down and put a Trap Door at the top leading to mine.
This is my mine which goes straight down to level twelve. So far I have found fifteen of so diamonds, which took me about half an hour to an hour. The stair way down it three blocks in width and about four in hight. With it being so high you can run down whilst not hitting your head, which slows your character down.