Icelandic Designer Hafsteinn Juliusson came up with this awesome idea/design.

 Growing Jewelry is a redefinition of modern values. It is a clash of jewelry an gardening; couture and organism. The collection of this hand jewelry is designed for people in metropolitan cities and is an experiment in drawing nature toward man, as nature being the presupposition of life

I really love the idea and the design (But I'm so bad taking care of my plants that I doubt i can be responsible for a growing jewelry).