Sea shell plate is in another treasury. This one is called Under the Sea, created by Hirjalda Mobley.
http://www.etsy.com/treasury/ODEzMjAyN3wyNzIwMzQ0MzIx/under-the-sea?index=0

 Her shop at etsy is called sofisticata. You should check out her shop. She creates really fabulous hair and shoe clips.