I have these large, square, shallow drawer-like things that go under my son's bed. You can see the pieces easily, and they are accessible.
In two, he does basic legos pieces. In another, he has all the weird pieces like wheels, wings, doors, etc. And then we have a tackle box like thing with dividers that we put all those tiny pieces in (anything smaller than a 2 top). And another box for people, their accessories and pieces. This way he can find the pieces he needs really easily, and he does not have to constantly dump out tubs and pick them back up.
Then, we have a big shelf with the creations and inventions he wants to display and the Star Wars series. And right now, my dining room table is covered in an entire, big scene. I am thinking about getting a long, thin desk for his room so he can set up the themes there and still have access to them to play.
I would love a lego room! With a lego wall with drawers for all the pieces like at the store. Wouldn't that be nice?