At www.themousemarket.com, I sell hand-sculpted miniature food for dollhouses and food jewelry, and I use the round labels for all of my product packages. I also send out welcome kits to new customers, and I use the round labels to decorate the package with my logo.
The online templates at OnlineLabels.com are super helpful. Provided I use those when designing my labels, which I do in Adobe Illustrator, they turn out great every time.