Lately I've been thinking about terrains, because it'd be cool to replace some of the polished ones with so-called rough XPZ versions. Now many are still waiting at the starting point, and I also would like to remodel a few tiles.
Partly I think it'd be a waste of work to rough up intact tiles in a sexy way or something. Technically speaking, a 8-bit 16x16 palette isn't the most ideal for messy styling with endless color variations. Sometimes you have to just give up or simplify and settle for compromises in the long run anyway. So it's also practical to leave the original designs with their models and colors as a reminder of the vanilla world.