This is the inside of an Anniversary card I made for my DH. I was happy with how this turned out - I wanted the heart and stamped words to look as though they were in the background and decided to print the words onto a transparency.
I used the same paper for the inside of the card as the card was made from. Cut the inside to 5-1/4 X 4 and lined the edge of it with a silver paint pen.
The transparency is attached by running a thin strip of glue along the top edge of the cardstock.
Two things to keep in mind: 1) When gluing the transparency down if it touches the glue it's glued right there - so be careful. 2) When printing remember to reverse the words (mirror image) and print on the rough side of the transparency if your using an Ink Jet Printer.