We've talked about rabbithole rugs before and making our own rabbitholes. At the time I was like why, just use the ones that come with the town you're playing in. I feel terrible for thinking that way!!
While I was play testing someone's world file they made in CAW they had placed a few or more player-made community lots, like the police station. I absolutely -loved- playing with that. They also had a hospital, restaurant, ice cream shop and other cutesy community lots.
It's actually made me consider maybe trying to use the rabbithole rugs to make my own police station and other community lots.
Though I don't know how well they'd work with some of the careers like the Private Investigator career. Specially if trying to use a player-made stadium or science lab.