Can you put whole eggs in a blender?
First off, the blender should not be damaged by the shells; if it is, it should have been replaced anyway. The mass of the shells is simply not enough to damage the blender in any significant way.

I would not, however, recommend eating the product, for a few reasons:


You cannot be confident that the egg shell has been completely pulverised. At some point, the blades stop chopping the shell, and simply spins it around
Whenever using egg shells for presentation, they should be thoroughly cleaned and sterilized, because you don't know what is coating it. You may very conceivably contract diseases from bacteria on the shell.