Twig Plant Markers- Such a cute green idea! Makes an easy gift, too.
DIY Plant Markers for Your Garden- Creative plant labels and plant markers are a great way to mark your plants and garden. - Gardening And Patio
Key ring - hole punch your plant tags - 24 Simple Yet Brilliant (or rather good) Garden Problem Solvers
Stone Herb Markers use a white Sharpie pen. I'm about to plant my herb garden. What a good idea.
truebluemeandyou: DIY Metal Stamped Washer Plant Tag Tutorial from garden therapy. This is a good tutorial for stamping on washers that you can use as charms, pendants, tags, etc…