On the matter of atheist t-shirts, my avatar is from one. (I own the t-shirt.) For some reason it even offends teachers around here (except my brother-in-law in Texas. We sent him one that has Pb-->Au and he absolutely loves it. Wears it frequently to school when he can.
"Be ye not lost amongst Precept of Order." - Book of Uterus, 1:5, "Principia Discordia, or How I Found Goddess and What I Did to Her When I Found Her."