I chosen the ring with leopard prints. I like it very much. Good workmanship and really can't tell that it uses nail polish inside.
I m sure that it will look better with those special nail polish colors which cannot be easily achieved by using normal paint. So this is kind of an advantage if you really like a color and customized it into an accessory.
I've gotten this from http://poshpolish.livejournal.com/
If you are interested, can check it out =)