that is a link to another thread where they are posting pictures of duck eggs. There are a lot of different colors of duck eggs... some are blue some green some dark grey almost black and many other colors... you should be able to find one you like
cayugas lay them from off white to bluish green to nearly jet black. Many different breeds lay the greenish bluish ones outside of that in domestics, it's pretty much off white. Wild types do have a good range in color as well. most are tan to white though.