Apple seeds strung together on a piece of strong black thread will make a necklace that you will be proud to wear or to give away.
The best time to string the seeds is when they are damp and fresh, so a good system is to have a needle all threaded, adding seeds to it every time you have some. Push the needle through a window curtain and let the string hang there until you are ready to add more seeds.
It will take a long time to save enough seeds to make one of these necklaces, but when you see how pretty it is you will feel that it was worth taking the trouble.
