A thought crossed my mind some time ago. Widowmaker's skin is bluish-purple because her heartrate is lower then normal, (To assist her aim) right? So, if she were to engage in a (ahem) rigorous activity raises her heartrate higher then normal, that would cause her skin to turn a more natural color over the course of a…(ahem) right?

Like she'd turn a more normal color if she was feeling a bit erm…flustered.

…just a thought.