Any interior designer can create a specific atmosphere just by putting together several pieces and unifying them in a single theme. There are interior designers who have a bias for certain motifs like eclectic, modern or even country style. Some go for simple designs without the clutter.
Interior design is not only aesthetic but also functional depending on the requirements of the client. An interior designer can make a small room spacious and an otherwise cluttered room into an orderly one. Interior design is used just about anywhere from homes, offices to commercial buildings.
The interiors of a room should always match the personality of the person who will occupy that room. This is the reason why designers always work closely with their clients so they can make sure that they get a feel of what their clients want in terms of design style.