Please review my concept
diiq: What follows is not physical truth, but emotional truth --- alas, that is what counts when you want to market a product like this.I find your concept alarming. On paper or digitally, my  signature is a symbol whose only referent is me. Not Sam, or diiq --- Sam points to a thousand thousand different individuals. But my signature points to me because I am the only person who can produce it.If you want people to accept this product, you'll need to convince them that the signature they recieve is:  a) absolutely unique to them
  b) representative of them
  c) still points back to them

If I sign my name using Disney's trademark hand, people will see Disney, despite the fact that it's my name. Is there really enough variety in your showcase that I will believe people won't recognize your work?To make this work, your designer(s) will have to become such master forgers that any hint of their own personal style vanishes. I... wouldn't want to be one of those designers.