Wow, I got more replies than I expected.
I had one thing to mention...
I gathered so many Legos that I was forced to seperate them by color (red is seperated by shape, as well) just so that we could find things. It's still really awful trying to find things, though, especially in the "black box". It's pretty big, and there are a bunch of big pieces in there. We used to keep the strings with anchors and stuff attached in there. They got tangled beyond un-tanglement, and we had to cut off the anchors and throw away the clod of string, lol.
We also have a ton of people (or as some people say, minifigures). We like to make them look good and normal. I hate when kids come over and mess with everything. They usually make people bald, or with dumb clothes that don't match with the helmet, etc.
Anyway. I used to build towns on our ping-pong table. It was always a challenge to arrange the streets and houses to look interesting and fit on the table at the same time. We would make the kind of houses that are nice and big, and the roof lifts off so you can get inside. We made a big mansion like that once, but the floors were really weak, and we didn't do it again. Now most of the houses are the boring open-back kind, because we're lazy.
