There are just a few items available, including a Flag, Antique Masthead, Treasure Map and Pirate Skull. These four are available for between 200 and 500 coins.
A fifth item is available on the game’s props page, in the form of the Pirate Ship itself, which is an animated item that bobs up and down in the water. It is a premium item, available for either 15 Facebook Credits or 18 Pearls.
You can also pick up a wallpaper for your aquarium entitled “Deep Sea Shipwreck,” that is available for either 30 Facebook Credits or 36 Pearls.