Some hardware stores have film for darkening windows, but the best thing I have seen is "window wallpaper". You get it at wallpaper stores. Some is transparent, some not. Some is plain, some with very pretty patterns. You should find what you want with no trouble.
If i were you i would get some dark window tent i believe a 15% visable rate would work well for this youcan find it pretty much anywere that car related stuff is sold they also have the kind that you just cut and put on easy to do.
01:59PM | 10/05/13
PureModern.com has a great selection of window films for privacy and decorative.