I'm sure this has been done by others over the years, but I decided today that I'm going to use the board game Dungeon (by TSR) map as a dungeon and stick it somewhere in my West Marches campaign.
It might be a good choice for my "8-Bit Realm" where I'll have everyone make versions of their PCs using Retro Phaze (the OSR/classic CRPG mashup game). Should be fun!
I think I've got a file somewhere listing the creature and treasure cards from Dungeon. I unfortunately don't have a copy of the game. But with the list I can make the Retro Phaze (or just normal 5E D&D if I don't use this for the 8-Bit Realm) encounter tables and random loot tables.