"The pain, the pain"   said in my best Mr. Smith voice.....(Lost In Space)

 

So the decorating idea is for the top two windows?

 

And yes, you can do a LOT with vinyl that you cannot do easily with glass. A lot less edges required, and more complex curves are possible. And the cost is probably 1% of a custom glass piece.

 

Perhaps, I could make some suggestions, but can you narrow it down a bit? Along what lines are you thinking?

 

And remember, while you have two windows, you don't neccessarily need two different images, One large image on two panes could be interesting too!