DC Design House Privacy Screen for bathroom window. You could make it horizontally too and not as wide as the window, put it on a track instead of a blind. This way it would shield the sun, and diver the air if the window is open.
I decided that I didn't want to use curtains on our bathroom window so I was trying to find an alternative. I looked at the window films that they sell and didn't like how expensive they were. DIY window film with contact paper!