I also made this little 8-ball key chain hanger thing to put on the zipper pull of my pool case. I used the large bottle cap. Flatten it out with the Big Shot. Punch a 1" piece of black cardstock out. Then a 1/2" piece of white. I had to hand-write the number 8 on with a Sharpie, since I didn't have any stamps small enough.
Attached all the cardstock to the flattened bottle cap with Crystal Effects. Let it dry overnight. Then I filled it in with Crystal Effects again, so it makes a domed bubble...that took 2 days to dry completely!
Punched a hole in it with the Crop-o-dile, and added some ball&chain that I got at the craft store.
Supplies you'll need to make this:
Paper: Basic Black (121045), Whisper White (100730)
Other: Big Shot (113439), Bottle caps (retired), 1" circle punch (119868), 1/2" circle punch (119869), Black Sharpie pen, Crystal Effects (101055), Crop-o-dile (craft store), Ball & Chain (craft store - I got a package from Tim Holz).
Order your supplies on-line here!