As might be evident from a minority of posts, I don't just play with Warhammer 40,000 models - I also collect and build Lego. "Collect and build"? OK - I play with Lego.
My collection has been built up from what a lot of AFOLs (Adult Fans Of Lego) call my "Dark Ages". That is, the time after childhood, when you put your Lego away, until adulthood, when you pick it up again. So, I have been buying Lego for over ten years - since about 1998 when Star Wars Lego first came out.
In that time I have collected about 70,000 pieces of Lego, and that is a lot of bricks to pick from when building. There are lots of ways to store Lego. I use tray boxes - the sort that can be used to store stationery. I also use Fischer compartment trays (which I also use to store WH40K figures.)
The tray boxes are stacked in rough categories: from left to right they are Technic, transport (wheels, engines, wings), flats, the all-encompassing 'misc', bricks, slopes and creatures.
The stacks rest on a few kitchen cupboards, which are used to store other toys and games. Lego instructions and catalogues are in a filing cabinet. This is all starting to sound more than a little retentive - but without some sort of storage system, it would be chaos!
Minifigures and things minifigures use like tools and weapons are in the Fischer trays.
I use Keji storage boxes, which come in 5 drawer, 4 drawer and 3 drawer versions. Most of these were bought from Officeworks at about AUD 15 each. I also have a few slightly larger ones bought from KMart.
Because some of the drawers are getting full, I try to keep pieces of the same colour attached. (Sorting by piece type first is easier than sorting by colour.) This makes them easier to find in the drawer, and reduces the chance of an accident sending some crucial Lego part into the unknown recesses of the room.
There are also two much larger seven-drawer boxes, also bought from Officeworks. They can be seen on the lower right in the big pictures, in line with the cupboards. They are used for bulky parts like Lego train tracks, or parts for which I have accumulated a very large number like the classic 2 x 4 Lego brick.
Keji 5 Drawer storage box.