In Overwatch there are unlockable items called Sprays, that along with skins and poses, change something about your character.
However, I have no idea what they do. Skins and Poses are pretty straightforward, but what are sprays for? I was thinking it was an add on for the skin you choose, like a decal, but I can't see it displayed anywhere on the body.
What are they for and what do they do?