http://www.forrestrace.com/glass-etching/
Etching glass window?
When etching glass window, do you have to use stencils created for that, or can you make your own? In other words, do the stencils have to be made from a certain material? Also, how much etching cream do you need for a standard window in a house? Thanks!
You can make your own stencils. No problem there.
It is the etching cream that does the work; Call some craft place like Michaels and ask them how much etching cream you will need for a window size X by X. Have you also thought about using decals and window films.
Go to Google and type in window films; window decals and window designs. There is a world of ideas there. Hope this helps.
Glass Etching Tutorial