I know that many people here are involved with creating RPG-style boardgames, so I thought it would be helpful to post a goldmine of a discovery I made yesterday:
http://www.davegh.com/blade/davegh.htm
This website contains hundreds, if not thousands, of high-resolution terrain textures that would be great for prototypes. Tiles include floors, walls, architectural details, and a whole lot more.
Enjoy!
Sweet! Good find, and timely too! I'm working on a prototype that needs textures (floors, grass, etc.), This should do nicely!