A little bit of a tangent, but my brother does a lot of bottlecap projects, like this:

https://fbcdn-sphotos-a-a.akamaihd.net/hphotos-ak-xpa1/v/t1....

...and this:

https://scontent-b.xx.fbcdn.net/hphotos-xfp1/v/t1.0-9/106227...