Heres some pics from my project today, I turned my fairly large walk-in closet into a vocal booth.
Heres what it started as
Heres with all the crap removed and just the shelves left.
Blankets put up on the wall, with mattress foam underneath.
So thats pretty much it, I plan on getting some real acoustics foam for the other bare wall and the ceiling, tell me what you guys think.