A while back I decided to try and start using all the specialty papers I've got lying around. When I was a child I remember using transparent paper one of my parents brought home from Germany. After looking for a similar product in Canada for years, I got the chance to go to the source. The paper is a cross between tissue paper and wax paper, being thicker than tissue but not grainy, and yet also being thinner than wax and available in multiple colours.
It wasn't easy to locate, but I did find some. And here's a card I made with it. I cut the tree out with a craft knife, then cut a frame out of my base card so the transparency of the paper would be visible. Using some other colours, I punched leaves. This is the card in regular light.
Transparent Paper: Folia Paper
Punch: ? not sure, it's a cheap punch I picked up a craft show with no logo on it