Here's another type of gift card holder that's easy to make.
The cardstock is 8" x 3.5" and scored at 3.5" and 7". The finished size is 3.5" x 3.5". You simply punch a half circle out of the longer section and put adhesive up the sides. Decorate however you want to. Super duper easy, and you can get three out of a single piece of cardstock. If you're mass producing, do your scoring before you cut for increased efficiency. The gold and silver waffle paper makes a nice bow or knot, and makes it quite festive.