You know how much I love to find creative uses for all sorts of "junk"; I just stumbled upon this fun link of ideas for your surplus of avocado pits which you might have wanted to dump into the trash (or, at most, into the compost pile).
We came up with an idea of our own.
(Photo isn't mine. USB isn't working for some reason. Taken from here.)
Look at these seeds. Don't they rather look like eggs? We think they do (especially the large ones). The brown outer shell is pretty easily peeled once the seed is washed and dried. We have accumulated a few this way, and intend to use them as "dummy eggs", to encourage our hens to lay where we want them to lay.
What do you think? Will it work? I'll be waiting with baited breath for the results of our ingenuity... :o)