Background Colors: Matches T|A theme colors.

Picture: A large crowd of very diverse people, young, old, different skin colors/ethnicity, different occupations and so on.

Top of billboard reads in large letters: YOU ARE NOT ALONE

Bottom of billboard says: thinkatheist.com

I think if T|A is going to put up a billboard it should be focused on supporting other atheists and/or getting theists to realize that atheists are normal people found in every walk of life.