Dreams are really good inspiration. I'm making a map in Hammer++ that's a mishmash of various places from my dreams
Wish I had the more interesting images of it on my phone though, so I have to just post this older version of part of the main 'hub' dream space (my childhood home)

Took a break from a Goldsrc project to bang out a liminal space map in Source because I got a major itch to commit some of the imagery I've seen in dreams to something tangible. I posted this before in an unrelated thread but this is pretty much my old house's second floor
I intend for it to be explored in VR so walking around in a mostly to scale recreation of a house I haven't lived in for almost 15 years was a fucking trip

Anyone make their own liminal spaces? Source Engine is honestly THE engine for doing it, IMO.