What is a diploma in interior design? This type of program prepares students to design functional and aesthetically pleasing residential, institutional and commercial spaces. Students may learn to consider shape, color, texture and style when choosing and combining furnishings, lighting and materials to create a pleasing and functional look.Completing an interior design program can open up new job opportunities, but participants can utilize their skills in their personal lives as well. They may learn to follow a budget and can use their design skills to arrange and adorn their own homes.