Cottage Hill's Newspaper Seed Pots:
Anthropologie's Vintage Silverware Plant Markers:
Gardening Tips and Ideas recommends grinding up egg shells in your food processor then sprinkling around the base of tomato plants to ward off blossom end rot.
I have also used egg shells to start seedlings before transferring them to a larger pot:
Don't forget to join Tutorial Tuesday below. There are lots of great ideas to see and you might have a tutorial of your own to add!