[A few blogger have beat me to this - I wrote it a few days ago but set it to post today. Oh well!]
This was a new one on me - check out dozens more images at Monster Brains! That, cats and kittens, is straight up D&D - unadorned, unofficial, driven by imagination and full of wonder.
Now if Risus Monkey can just turn those dungeons into some geomorphs, we've really got something!