For anyone who hasn't seen this: http://www.notmartha.org/tomake/windowfrosting.html
Thank you, thank you, thank you is all I have to say!
I am right across from a condo and need privacy from balcony perverts. This was the coolest thing I'd ever seen and wanted to give it a try. I first attempted beer and epsom salts but that wasn't as opaque as I require. From the outside, with all lights blazing, you can only see the glow of light and muddled shadows of the plants in my window.
I think this cost like $15 total for all supplies and I have enough to do another window at least. PS - Both sides are now done. This first pic is just to show the amazing contrast.
To get this affect, I slabbed on bunch of the product (best to do the edges and then fill in the middle) and then blotted w/ a crotched cloth for texture. I evened everything out w/ just a plain old terry face cloth. It dried quickly and there was no mess or smell.
The only thing I find is that because of the way my window faces, my room "looks" cold. You could probably mix a cream/whatever coloured paint to war, it up a bit. I added some "skeleton" leaves when it was still wet for fun. As it turns out, the tree outside my window creates a shadow and even tho it's winter, I still pretend there are leaves on the tree!
Anyway: here are the photos!