Coastal Christmas Decor. So simple. So Beautiful! Oyster Shell Ornament SET of 3 Beach Christmas Ornament, Beach Christmas, Coastal Christmas, Nautical Holiday Decor by CoastalCornucopia on Etsy https://www.etsy.com/listing/468267106/oyster-shell-ornament-set-of-3-aqua
You can crown your Christmas tree with anything! How about a whale as a tree topper? Featured here: http://www.completely-coastal.com/2013/11/white-Christmas-trees-beach-coastal.html (3rd tree from the top).