There has been a call to separate the atheists who care about social justice and those who do not. Pteryxx suggested a logo of A+. Well, it looks like people now want to call this subgroup "atheism+". Others have justified the idea of the "+" as meaning atheism plus social justice, etc. I am most certainly on board! I have even added a "+" to my logo above.
Also, I really like the logo suggested by One Thousand Needles. Some of us are just waiting for obvious permission for its use.