See BuzzFeed’s full write-up of this window film.
Promising review: “Love this stuff! So easy to put up. It’s not quite as good for privacy as some of the other designs but it’s pretty. Love the all over rainbow effects when the sun shines through it! I cut out some circles from an extra piece and added them to make the window look more interesting. It was cloudy the day I took the pictures.” —Rachel
Get it from Amazon for $13.99+ (available in seven colors).