In recent news, in the latest update, it struck me that "Hey, couldn't you make a concept tile editor fairly easy?" There's already some assets to use. A, It could help with creative concepts. B, It could be fun :D
1. Dungeon from a Dungeon! http://forums.obsidian.net/topic/63207-update-39-non-core-classes-cooldowns-attack-resolution-damage-vs-armor-and-a-tileset/?p=1302826
2. Forest from a Dungeon/Which can be transformed into "Tilesets" as well: http://forums.obsidian.net/topic/63207-update-39-non-core-classes-cooldowns-attack-resolution-damage-vs-armor-and-a-tileset/?p=1302944 I do