I do love ship memorabilia, especially menus, photos, and other items that take me back to earlier days on cruises.
I find it amusing to come across, usually in thrift stores, souvenir items from ports. Ashtray/shot glass/salt shaker, "Souvenir of Aruba/Mexico/Margaritaville". It seems that some people just have to buy things in all their ports; are they buying for themselves, or for their lucky in-laws?