Design Principles

http://www.dreamstime.com/stock-image-symmetrical-background-image16099711 (Symmetrical)

 http://www.123rf.com/photo_5336584_rose-on-white-background.html (Asymmetrical)

http://www.123rf.com/photo_5243082_stage-style-2d-rays-gradient-background-with-a-spotlight-at-low-middle.html (Radial)













http://www.123rf.com/photo_14089667_gay-and-lesbian-allow-and-prohibited-sign-emblem-icons-isolated-on-white.html (Rule of Third)