The texture this technique creates is almost like fabric after it is adhered to cardstock. No one will probably guess it's a napkin. So here's an easy tutorial to get you started:
Here's what you need:
decorative paper napkin
pre-cut cardstock( cut to the size of your card)
newsprint paper or something similar to it( I used the paper that comes stuffed in purses)
Iron( heated to medium high- NO STEAM)
First separate your paper napkin(which is probably 2- or 3-ply. You should have a very thin decorative top layer. Spread your newspaper print over your ironing surface and then place your cardstock on top of it. Cut a generous piece of plastic wrap and spread it over the cardstock piece so that it overlaps it. Place your paper napkin over the plastic and the cardstock.
Take another piece of thin paper(like the newsprint type) and place it over the paper napkin, plastic wrap and cardstock sandwich. Take your iron (that is heated to medium heat -NO STEAM) and go over the sandwich repeatedly until the paper napkin is adhered to the cardstock. Keep lifting the top paper and checking to see if it is.
After it appears that all of the napkin is adhered, turn the sandwich over and cut away all the excess plastic and napkin from all four sides.
Adhere this piece to your card base and VOILA!
I hope you like this tutorial and I can't wait to see some of your creations using it.