That little snowball that Dyson Logos started back in 2009 has become an avalanche. More and more folks from the DIY RPG community are pitching in with their own tiles based on his 10'x10'/2-exits-to-the-side format. The first on the bandwagon was Risus Monkey (he said modestly), followed by the Stonewerks, Talysman, and Sigurd Sigurd. JD Jarvis of Aeons & Auguries filled in the gaps with some oddly shaped tiles and Amanda Michaels adapted the format to a post-apocalyptic urban setting.
Now Paul Gorman of Quickly, Quietly, Carefully jumps into the mix with two sets of tiles (here and here). Thanks to all these geomorphs, Dave's Mapper is becoming the "go-to" tool for generating sweet dungeons on the fly.