I'm inspired to get some kind of cool container (rather than the Lego ones) to attach to the wall with the Lego plate above in the boys' room! They could do some creative stuff--and the Legos would be off the floor! Pfst, who am I kidding, they'd still be on the floor....
LEGO Table from IKEA. The bins (also from IKEA) are made to slide into all the nice slots. The table top is made from a 5' x 5' piece of baltic birch plywood cut to 4' 8". I rounded the corners of the top, routed 1/8" edge, and sanded it using an orbital sander. spray paint which matched the blue LEGO color exactly, and then a clear coat) bought from Home Depot.
Love all three of these projects for organizing LEGOS, especially the DIY drawstring play mat!