My favorite color is any one that doesn't stain the back of my uniform! To narrow that down further, any belt that doesn't have stripes--sorry, I think tape is tacky. When I trained in Aikido, you were white until you made Black belt. This made you demonstrate your rank by your behavior and your technique, not by the way you struted around with a colored belt. After a long period of time, your white belt was pretty dingy and dirty but you wore it with pride! I'd almost think a dingy colored belt is my favorite. However, I wouldn't trade a Black belt for a dingy belt. My next goal is a frayed and ratty belt. In some schools that mark degrees of Black belt with Roman numbers--I, II, III--students add a new I to their old rank. That belt is looking very frayed before they reach 4th dan. So, my favorite belt is a frayed and ratty Black belt.