One of the most common bathroom accessories is a tray. These can either be smaller soap bar dishes or wider trays for multiple items.
If you use a soap bar, a soap dish is a must in a bathroom. Ideally, the soap dish should have somewhat high edges to keep the soap bar in place. It should also have raised bars or some other type of draining method for allowing the moisture to drip off of the soap bar.
A multi-functional tray can be a great addition to a bathroom if you tend to wear jewelry that you need to take off while you're washing up. The tray will be the place you always put that ring, for instance, so you never lose it. Plus, the edges will keep your items in place.
However, multi-use trays can also make stylish places to organize toiletry items, like small bottles of soap or folded rags.