Inked Adventures Hand Drawn Geomorph Tiles
(c) Art Billiam Babble / Inked Adventures 2013
Also sold as a printable PDF http://bit.ly/IAgeomorph
I draw the original maps in fineliner pen and then tweek them on a computer. Dungeon "geomorphs" are almost as old as tabletop roleplaying games themselves (such as D&D) - they are basically just tileable pre-drawn small scale maps of caves and dungeons which can be assembled together to create very large dungeons. They are lots of fun just to play about with.
Inked Adventures home site: http://inkedadventures.com/main