A sailors' valentine is a type of antique souvenir, or sentimental gift, originally brought home from a sailor's voyage at sea for his loved one between 1830 and 1890. Sailor valentines are typically octagonal, glass fronted, hinged wooden boxes ranging from 8" to 15" in width, displaying intricate symmetrical designs composed entirely of small sea shells of various colors glued onto a backing. Patterns often feature a centerpiece such as a compass rose or a heart design, hence the name, and in some cases the small shells are used to spell out a sentimental message. (source wikipedia)
You can do the same with Succulents.