I use to have a favorite color. It was purple.
And then my favorite colored changed, and it was green, then blue, then back to green, a brief stint in red, so on and so forth.
At one point during college when I was actually meeting better known designers from time to time I thought it would be fun to collect their favorite colors. By which I mean I planned to ask them when I met them what their favorite color was. I thought it was a simple enough exercise, never intending to be anything more than a brief return to younger days when things were simple and you had a favorite color. So when a few friends and I took a 500 mile road trip to visit Chicago and attend a small design conference in Dekalb I took the opportunity to ask Paula Scher what her favorite color was, and was somewhat frustrated with her answer.