I had the idea of doing a different kind of "window" in the face of an envelope. I made the envelope with my Stamp-it envelope template, and I used the case of one of my paper punches as a template, and cut a square with rounded edges. Then I added some thin plastic film / polypropylene and adhered it with glue. Doesn't look too bad? You can send this in the mail, and the recipient will see the little bear peeking through the window.