Commercial Interiors. The new Commercial Interiors design course offers you the opportunity to invision and create the interiors of commercial environments. Taught by industry experts, and in synergy with the dynamic Billy Blue environment, this new course offers an unsurpassed opportunity for creating the future of commercial spaces.ph: 1300 851 245info@billyblue.edu.auBilly Blue offers the following course optionsMain site linkGraphic DesignDigital media DesignGame DesignRetails and commercil design2D/3D AnimationInteractive web designLink to William Blue College of Hospitality and TourismLink to Billy Blue College of English