I have a tub of around 14,000 lego pieces sitting six feet away, and about 4000 k'nex pieces yonder further in the closest. I also had a few
Capsela sets. edit: oh yes, link'n logs too!
Now for the weird one. My mother had a whole bunch of stencils for various kinds of design work, one of which was a bunch of road map symbols (lane merge, speed bump, highway signs, etc). I used to take said stencil and connect various symbols on a piece of paper in an intricate system to create, as I called them, "poop plants" (mature person translation: sewage treatment facility). I had all the different parts of the system named and what they did.