Here are some additional 30″x30″ gridless maps for Roll20.net use. Perfect for Desert or Mountain campaigns/encounters.
Note: These maps are my own work and have in part been created by reproducing found textures online. They’re FREE to use.
Desert and Mountain RPG Maps
The Dungeon Geek 
Love the mountain paths! I’ve been looking all over for these – they’ll be perfect for my Pathfinder game. Where did you get the rock textures? The shading is really good, and I’d love to use something similar to create some more of these style maps for the game.