The outside of the temple features grass, small trees, and a water source. Inside is a main room with three chests and a smaller side room with one small chest.
The Yellow Temple is located in the Desert Biome, in an oasis type environment.
To spawn a Yellow Dragon Egg you need to place 40 Wool of any color in the chest in the smaller side room.
Yellow Temples seem to have a penchant for crashing the client in version 0.5.3