4 Answers

Make a plum smoothie. Seven recipes here>> http://www.womenshealthmag.com/food/plum-smoothies

You could dry them to make prunes.  Or I bet you could make a wine or other spirit from them.  

I believe it would be best to can them whole or in half in their own juice. Freezing would probably make them turn dark and they wouldn't look like anything you would want to eat. If you did some up in jam, you could give it away for the holidays and birthdays etc.

In the 1920s there link was some considerable interest in Chinese or Japanese aesthetic motifs. But today we try to use them in the link right way use them in a respectful way. So having a source of inspiration which is link true and then doing something which is also fun and true. And this one I think works super well.