The Lego table goes awesome! Uses 4 IKEA's TROFAST frames. 4 feet x 6 feet table top. Legos are organized by color in the bins. I'd make the overhang a little larger so chairs can scoot right up to the table.
An Ikea Hack custom train and activity table with TONS of storage. This is such an an EASY DIY project and a great way to get all of those toys up off the floor and organized once and for all! Maybe a Lego table and storage?