I was thinking much the same thing Laurie, that an actual material was going to be needed for stained glass.  Especially to do it quickly, and ummm, I am one of those non-modelling types.  I have more than one app for it, but thus far I haven't had much luck with any of them. 

Now, the problem I see with that is that the cames on most stained glass windows done for poser aren't separate from the glass material they are part of the texture.  So when the light did pass through it they wouldn't look solid.  The larger ones in the Haunted Mansion windows are, so it might be something to test on.