came across this on my browsing :
http://www.rpgnow.com/product/185154/Planstrom-Dungeon-Floorplan-System-Set-1
The Planström Dungeon Floorplan System is a universal grid system for the display and exploration of interior enviroments for role-playing and tabletop wargaming.
Print and cut dungeon rooms, corridors and doors to the required size for the published module or home-brew adventure you are playing and lay down elements to unveil the dungeon as it is explored. Print as many sheets as you need to create increasingly larger and more complex mega-dungeons.
Planström is designed on a 25mm / 5ft scale grid and is 100% compatible with the most popular miniatures ranges and tabletop roleplaying game systems.
Planström Dungeon Floorplan System Set One: Room, Corridor & Doors contains three unique sheets of hand-drawn dungeon tiles:
Planström Sheet 1A Rooms large flagstone set designed for rooms and open spaces
Planström Sheet 1B Corridors with smaller stones for corridors and enclosed spaces
Planström Sheet 1C Doors one sheet of dungeon doors for gateways, entrances and barriers.
Technical Specifications:
Scale / 25mm
Color / Mono (black)
Paper Size / DIN A4 (will print confortably on US letter paper)
Resolution / 1200 dpi
Sheets / 3
Filetype / PDF
Filesize / 1.2 MB
Planstrom is designed for generic dungeon-crawl gaming. Planström visual aids are free from details tied to a specific locations, themes or settings, giving both DM's and players imagninations for the ultimate in dungeon crawls - be it ancient temple ruins, a dwarven city or the dungeons of The Necromancer.
Zhu Industries recommends using a metal straight edge and a sharp craft knife or scalpel to cut printed sheets to the desired size. Please ensure your printer is set to print 100% - not scale to fit.
might be of interest to some.