Yes, I challenged myself once to work in black and white only. It was a B&W ATC swap. Since I'm absolutely goofy about color, I thought "ok, I'll try this, but I'm not going to like it.". But guess what? They turned out pretty nice, kind of elegant-looking. But I haven't done anything since then in B&W.
My color fixation for the past couple of years has been purple, bright spring green and canary yellow, with a tiny dash of red or pink sometimes. I thought it was a phase I was going through, but so far its sticking with me. I'm not complaining, of course, I really love the color combination.
If a man does not keep pace with his companions, perhaps it is because he hears a different drummer. Let him step to the music he hears, however measured and far away. -- Thoreau
Prince William County, VA