male online --> a pic of colored male
male offline --> a pic of uncolored male
female online --> a picture of colored female
female offline --> a pic of uncolred female
:D
nice and simple

And no gender specified ?

It could perhaps be a monochrome image?

I believe that since the male/female information is in the drop down itself and the online/offline information is also provided, you could easily do this yourself with some html logic :).