I was wondering, which TV-shows do you find it easier to make icons of than other? Which is the hardest? In terms of light, color and quality?

I find shows like Lost, Once Upon A Time and Merlin to be quite easy to work with (most of the time), because of wonderful close-up scenes, gorgeous scenery and lovely colors. But shows like Fringe, Grey's Anatomy, Criminal Minds are more difficult because of more "dull" colors and camera angles (makes it harder to find a good crop). Idk, what do you think?