(within reason)
I've got a 4-layer board on the way, and I want to make something out of the ordinary.
Initial thought: Pi Zero mini-terminal + Wii portable
Wrap 'em in a 3DS XL case with a keyboard on the bottom half ( a la @Luke ).
But I want to hear more!
Since the PTH regulators can be purchased for a significantly reduced price when bought in bulk, I figure that it would be somewhat profitable and cheaper. I would love to see this get put into action, though it may not happen.