I would love to see layouts for these!

Pepper Shredder - Tube distortion based on the twin valvecaster:

Was avaliable as a DIY kit from Tube-Town, but discontinued
Supposed to sound much better then the valvecaster :)
Their Vanilla overdrive also looks interesting:

The Banana Booster is another (less interesing imo) valvecaster variant.

The schematics is from tube-town.net
cheers
/ Fredrik
check out my building blog at www.parasitstudio.se