Indian Mughal architecture adopted the use of mirrors in certain rooms. I have provided pictures of what these rooms decorated with mirrors look like. These mirrors are adorned on the walls in conjuction with very intricate floral patterns. It is said if a person entered these rooms with a single candle the entire room would light up because of the relfections off the mirrors.
These pictures are from Mughal structures in Lahore (Pakistan) and Jaipur (India).
These are some videos showing some rooms decorated with mirrors. ("Sheesh Mahal" literally means palace of mirrors.)