Pattern page one: [link]
Pattern page two: [link]
You'll need 1/3 yard of material, matching thread, and the usual sewing equipment (scissors, thread, etc). Machine not required - I sew everything by hand. This makes an 8-inch tall pony, but the pattern can also be enlarged or shrunk; adjust material requirements accordingly.
This is as simple as I can make the pattern and still have it look decent! Anyone who can knows the basics of sewing will be able to use this.
If you don't know how to backstitch or ladder stitch, there are several tutorials here on DA and on YouTube.