I used to have my gear stashed in a wooden bar in the dining room. After that, it found a home for a while in a changing table (normally used when changing a baby's diaper) in the office/spare bedroom. Now it's in the laundry room, where all of the heat and some of the noise are kept away from people:

Some of the boards in the Bitfury rig are missing heatsinks because they arrived a few days before the heatsinks, but they're hashing OK without them. The BFL Jalapeños are controlled by the RPi in the Bitfury rig. The Bitfury and BFL hardware are running off a 550W Seasonic, while the Antminer has a 600W Corsair. Total hashrate is about 450 GH/s; power consumption is about 700W. Since the laundry room doesn't have a network run going to it, I'm using a powerline network adapter (not shown) for access.
Up to a point, more Bitfury hardware will just slot in...it's already expanded from 2 cards to 6, and then to 9. For more Antminers or other hardware, though, I'll probably need to figure out something better than just using the shelf that's already in the room. For more power, I'd most likely need to run another circuit. The room was set up for a gas dryer only, so there's no 240V 30A service in place. Adding a 14-30R outlet wouldn't be out of place, and it could feed a subpanel (?) with four independent 120V 15A circuits.