I'm also entering this in the Simon Wednesday Stamp-it challenge.
I actually can't remember which company made this stamp. I bought it at Paperific last week and it didn't have anything on the packaging. Now, although I was planning to white emboss this time, like debbie, this stamp just wouldn't lend itself to that, so I used Distress Markers on the stamp and spritized it a tiny bit (so the vellum wouldn't warp) and then stamped it on the paper. I then backed the vellum with cream card stock and sewed them together. The green card has been coloured with Pan Pastel.