Things you'll need:
a) Enough 1/8" rolled cork to make two 10" x 11" (approx.) rectangles. You can get this at most office supply stores. I've found not all rolled cork is the same. I prefer some I found at Staples. It uses slightly smaller particles of cork and is a little smoother than others I've seen.
b) Cotton fabric for backing the cork. Something like a bed sheet will do (enough to make a couple of 9" x 11" (approx.) rectangles. If you buy the fabric new, make sure to wash and iron it first to remove sizing. It'll stick better to the cork that way.
c) Fleece. Not too thick. Enough to make a 10" x 24" rectangle. Folded over it makes the inside pouch.
d) Template PDF (included with this instructable).
e) Fusible web. This is available at fabric stores. It's basically a thin sheet of hot-melt glue. With an iron, it's used to fuse the fabric backing to the cork to give the cork a little more strength. Get the heaviest variety of fusible web you can.
f) Iron, ironing board, and ironing cloth (anything to cover the fusible web when you're ironing it -- it'll really help save your iron from becoming a sticky mess).
g) Xacto knife (sharp blade) and a ruler/straight edge
h Wood glue and brush. Elmer's *wood* glue works fine.
i) Needle and thread (to sew the fleece into a pouch)
j) For gluing, a bunch of 1-1/4" wide Binder clips and about a dozen "hobby" sticks (I used sticks that were 1/4" wide and about as thick as popsicle sticks).
k) Sand paper for finishing. I used 180 grit for rough sanding and 400 wet/dry paper for finishing. The later leaves a very silky surface.