Hi all. Here's my short tutorial on how to frost a glass window with glass frosting spray. Although, this technically is how to frost glass doors we had in our bedroom for privacy.
I thought this was a great spray can which you can build up in layers and perfect to transform your glasswares, such as vases, christmas glass baubles, candle holders to windows like in my case above.
The next time I want to mystify a window on a piece of furniture (if it suits the theme of course). Here is the Plastikote spray I bought off Amazon which had the best reviews.
Note if it is for a bathroom, it may come off over time, so applying a vinyl (also available on Amazon) with a squeegee may be more suitable for you.

thecraftymummyblog
Brilliant!