Lego table made using Ikea's Trofast system. This is an awesome idea. I don't have kids so don't need legos, but I'm thinking this could be used for crafting - maybe a cutting board where the lego baseplate is. Measuring tape along the edges.
Darn, I wish I had seen this a few years ago! Each lego set is in a Container Store shoe box with a label either cut from the original box or printed out from the internet (if we threw the box away too soon). Lost & found bits are in a box of their own. All instruction books are kept in plastic sheet protectors and sorted (by theme then number) in 3-ring binders!