"Permuted Press", in it's normal font (like on the webpage logo) in white letters on a black t-shirt on the front.
Then, on the back, have a dark graveyard with the books & author's name on the tombstones. Maybe a creepy grim reaper standing by the signpost, looking in with his sickle ready. Maybe. ...maybe a few hands could be popping out from the graves?
Not a concrete idea, but an idea.