I don't know if they still make them, but there used to be stained glass patterns of Frank Lloyd Wright and Tiiffany windows. There may be coloring books, too, that will give you proportions.
I was lucky enough to go in Falling waters in the 70s, and was not prepared for all the noise. Now I live in the same city as a library he did. In order to add on to the campus, another building is being wedged in next to it. It will be interesting to see how it fits - or not