The shelves made of glass come with brackets you attach to the wall to hold the shelf in place. They can also be placed over a sink if you don't have a traditional medicine cabinet already there. It's a nice place to keep liquid soap bottles and hand towels ready for use. This frees up the area around the sink and tub so it doesn't have to be cluttered with all types of bottles and sponges.
Use decorative boxes and baskets: If your shelf is not simply decorative, but also used for storing items, it can still be attractive. Keeping items in decorative baskets or boxes can still give you the visual appeal you are looking for, while containing the items you need.
It is highly unlikely that you will have to acquire a building permit for this type of project, unless you decide to do any kind of plumbing or electrical wiring. When in doubt, be sure to check your city's building codes.
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