Garblag Games are a group of British roleplayers who focus on actual play videos. They have got a studio and everything.
As is the (wise) trend with content creators Garblag have also set up a Patreon. Right now, Patreon subscribers can download these dungeon themed character sheets.
In two weeks time Garblag Games will make these sheets available to everyone, Patreon subscriber or not. Either way, their page is worth bookmarking as these designs look pretty smart.