In the First Temple, the interior walls of the Kodesh were of cedar wood, overlaid with gold, and decorated with designs such as palm trees, flowers and Cherubim. During the Second Temple period, the walls of the Kodesh were covered with plates of gold. (Sources: Kings I, Ch. 6;Tanhuma Teruma 11; Midot 4:1). 
The Menorah
Contents:   Part I,    Part II,    Part III,    Part IV,    Part V,    Part VI,    Part VII