Graphic design is tied to absolutely everything that you see in front of you and all this can be replaced or changed.
Tired of a phone case - order a unique design.
If you want to put a logo or photo on a cup - no question =) the graphic designer will do it.
If you are a large company and you often have to send a commercial offer - be sure to order a design. After all, you need to competently and efficiently submit your product.