I can't tell you how long I have been waiting for something like this!!
(saw this on Poppytalk)
Here's some more info regarding customized plates (scroll down the comments to read what Michelle the LifestyleCrafts creator has to say).
I checked out the website to get more info. And at $149.99 it's pretty affordable. Although I'm hesitant to shell out the bucks until I can get my paws on some customizeable plates. Between this and gocco (or the other offshoots of home screenprinting that have sprung up in the last few months) I could open up my own printing+design studio! Or dream about it at least for now.