There are cling and adhesive films you can get on Amazon in various degrees of transparency. I would check them out first. You can also apply them in a pattern and leave bare spots.
Christy...There are some really nice clear contact paper...I used it in a bathroom and really like it.
As I was getting ready to answer this Q... I figured I might do a post on it. I just stippled a glass lighting for lighting using 50% glaze plus creamy white paint. You can also use frosted spray paint in a can. Depending on how much see through you want. Then I protect with a spray clearcoat. Will not last forever on a door -- depending on how much use. But you can scrape off and reapply, hopefully a a few years from now, if you like.