The Legaran, from the planet Legara IV, was a mysterious alien species. After 93 years of preliminaries by Vulcan Ambassador Sarek, they finally made First Contact with the Federation in 2366, during the Legaran Conference.
The Legarans were strictly adherent to protocol. Though nondescript physically, they prefer to live in a pool of thick swirling ooze, which was carefully maintained at a constant 150 °C. The Legarans preferred no furniture and no (wall) decoration. (TNG: "Sarek")