I like the Batman/Wonder Woman one. Personally, I don't like using pink/blue or skirt/pants to signify female and male - I'm a girl that never wears a skirt, and wears far more blue than pink, so these never made sense to me. If there is a lot of political correctness in this organization, they probably wouldn't approve of those gender indicators either.
Instead of something quilted, could you take pictures of a group of girls and a group of boys?