Alright, I posted my SFZ covers in the Files section.
They're modelled after NEC Avenue's other titles. The back insert is
styled like Monster Maker, which SFZ was supposed to be released with.
The inside cover and CD label are Super Darius/Side Arms Special style
(two of my first and favorite CD games).
These were made before I taught myself how to really use Photoshop, so
they will be replaced by something with at least a hand drawn logo
hopefully sooner than later.