On UK Scrappers my most recent swap has been an altered matchbox. My swappee's theme was fairies, and I knew just the stamp I wanted to use for the front! Unfortunately it was way too small, so I stamped it, scanned and enlarged it and printed it out to the correct size. I stiffened if with thin chipboard and painted it with irridescent paints. Once the matchbox was filled appropriately the front was glued on and the various finishing touches added.
Here is a photo of the back, to show that there is still a matchbox in there somewhere!
And some more shots of the front and inside: