Closets
Hanging clothes 3 rows high is a great idea to use that extra space, as long as you had some type of rod/tool to get the hangers off of the top row. At second thought it may be inconvenient, but you could rotate your clothing by seasons, so that when it is summer, you hang all your sweaters and long-sleeve shirts at the top. The winter would be harder though because I wear short-sleeve/summer shirts year-round with undershirts or sweaters over them. Putting cabinets up this high may be another option.
I like the mirror centered at the end of the closet.
Q