Well. The floor of my room is half covered with lego bricks, I have two bins full of bricks stacked on each other beneath a desk, which is also covered in bricks and small works in progress. In addition to this, I have a large plastic bag full of bricks in the corner. I have three book cases which are all half full of mocs, sets, and custom figures/armies. Then I have another desk, which is mostly taken up by a very large moc of Osgiliath I am working on. Strewn around said moc are more bricks and pieces. My dresser has some legos on top of it. I also have a couple boxes on the floor and in the closet which are full of mocs. Set on top of these boxes are small customs and extra pieces.
So, practically every surface in my room has legos on it, although I like working at my desk for large creations...
Also, I am normally more organized then this, but I recently moved, so I have yet to organize my space.