I recently picked up Adam Bahr‘s Tiny Dungeon (and by “Recently picked up” I mean “I kickstarted it and forgot to read updates by the developer until I got my copy in the mail, totally missing another kickstarter of his. Which I regret hardcore”)
So for my last pair of games of D&D at the shop, I’ve made some maps for us to play on. These are on some kind of thin, pressed cardboard with sharpie. They’re about 3 feet squarish and they look kinda cool.