30x30 Squares Dungeons for Improvised In-game Reference

People out there spend a lot of time on geomorphs. I'm not saying geomorphs are not cool – they are, for sure! But think about it. Say you're running a sandbox game with your fellow players; suddenly, the usual wandering monsters check loudly tells you "MONSTER LAIR!" and you're like "What the hell I have no such thing as a fucking monster lair dungeon in my notes noooo!!" and now you have three choices: pull out your geomorphs and build them up as randomly as you can, pull out your DMG and find Appendix A as fast as you can, or just decide not to follow the dice, and roll another encounter. Well, what about if, instead, you pulled out the Majestic Book of Random Mini-Dungeons? Only maps, of course, with some room to write on them what is in any given area. All in all, 99% of monster lair dungeons need nothing more than one encounter – the monster himself.

I'm not saying I'm doing this (too much stuff already on the go and definitely not enough time), but if you're trying to find a good idea for a fast and remunerative product, here you are. Seriously, I'd buy that, and so would probably many other DMs...