They have a history.

I bought them as a huge gray ship with 1000+ gray bricks. I build half of it, got bored, and tore it apart.

I used them to build several different Lego spaceships, none of which quite satisfied me enough to keep.

I used them to make a Lego pinball machine, which I destroyed after a week or two.

I then made a fort, and kept it for all of 2 seconds before I...

...tore it down and build a simple three story house. That's where they are currently.