I went with a classic, vintage, psychedelic San Francisco vibe for the art. 15x22 on French Oatmeal paper. Mule's legendary Halloween shows involve covering a certain band throughout the sets. This year's theme was The Who.

The poster art played off The Who's lyrics that I think applies perfect to the misunderstood  monster from Frankenstein :

--From Behind Blue Eyes

and the line 

"Don't Cry" hidden in the top

--From Baba O'Riley

There is also a Who icon as the Third eye on the monster.

Available at the Oakland show and upcoming on the Drowning Creek Web Store.