There has been a bit of talk about original designs lately, and this one kind of came to me: a cross between a Gibson SG and a Danelectro Long horn. Instead of short little devil horns, they would be long and exaggerated:
Depending on hardware and finish it could be just as appealing to the metal crowd as rockabilly and surf rock enthusiasts.
Not that straight up Danelectro style kits would go astray either...