This is crocheted with Coats & Clark Royale thread #10 and a #5 hook. Click on the photo for actual size which is 5" x 3½" The fabric is dense, strong and seamless so needs no lining as a coin purse. The thread is color fast so one can toss it in the wash if it gets grubby. I made something similar worked in the round many years ago, I've been using it to carry a comb, chapstick and such doohickeys for years and years. These things are indestructible. Plus it's easy to find in the bottom of a bag. I prefer these colors worked in the round because it grows into swirls of color with an especially cheerful effect. I added the little wrist strap for extra utility. It can be zipped inside if not needed.
http://www.ravelry.com/projects/panavia999/hippy-colors-coin-purse