All you need is paper, scissors, and tape. A stapler is optional (I used a stapler), you can use tape in place of the stapler.
Here are 2 videos to show you how to make the paper flowers:
You can use any kind of paper, but my experience has been that the thicker the paper, the harder it is to fold. You can use regular copy/printer paper, wrapping paper, scrapbook paper, a paper sack, etc. I even used aluminum foil (not so easy to work with), vellum, and tissue paper!
When using an 8 1/2" x 11" sheet of paper, your flower will measure 8" across, and will be about the size of the poinsettia on the left side of the key board. If you paper that is 4" wide it will look like the one on the right side of the keyboard. Both sizes would be fun hanging on a Christmas tree!