Ron, My Dad always said that you can buy anything you ever wanted at a steam rally! I will think about that at the next one i go to. I like this idea for the plants that need a permanent label for.
Spimula, I know what you mean, waterproof pencils, i did not think you could get them anymore, i have not seen one in years, will have to look harder.
Carolgratton, I have not needed to wash one since I moved in here, I leave them in my garden or even in a pot and they seem to just fade off. I have loads of lovely clean plant labels, usually marking the plants i can never remember the name of! also i am beginning to think that i have a bad batch of Sharpie markers!
Generally I am fascinated with the ideas you have all come up with for making your own free labels. I am a great fan of true recycling (no transportation and processing required!) and have been using old labels for years. I am being to run low now so for new seedlings i will start to use the Marg tube and milk carton ideas as i always have one or the other in the recycling bin.