The Fourth GM Inspiration: Dyson Logos
If I am going to use the 12 Days of Inspiration to highlight all of my favorite GM resources, I would be completely remiss if I did not bring up Dyson Logos's blog and books. I have gotten more mileage out of Dyson's postings on his site and used almost all the content of his Dyson's Delves books on Lulu in my campaigns over the last dozen or so years. Seriously! His cartography is incredible, providing evocative maps that don't always come with a keyed scenario, but contain enough conceptual imagery and "spatial evidence" of adventure to readily spark the imagination. His Delves books include many maps but also many keyed locations which I have adapted into scenarios in my own campaigns on numerous occasions. In fact my current Pathfinder 2E campaign is on map three of three of Dyson's maps I adapted to manage the first 6 or so levels of the campaign plot. Hell, while writing this I noticed he has hardcover editions of his Delves books which I decided I must have and ordered them (my old paperbacks are really falling apart).
There are a lot of maps you can find and develop online into your own games, but Dyson's maps are far and away the best in terms of being universally applicable to any fantasy RPG while still evoking a fantastic old school feel. I am sure most of you who still enjoy the print bloggosphere for RPGs already know who Dyson is, but on the off chance you haven't, and you enjoy customizing generic maps into your own scenarios, then you definitely should check out his blog and books at the links above.