As a D.Va main, I gotta say Officer D.Va is the first skin for her in a long time that I actually want.
Also, I made a really fun custom game mode based on "The Hidden" from Half-Life. It involves a Sombra who can repeatedly stealth, but can only melee (however, the melee deals 800 damage, so usually it insta-kills). She can also Relocate, but at a slightly longer cooldown than usual. She has a little more health, but not much, so you have to be very careful. The part that makes this extra fun is whoever kills the Hidden Sombra gets to be her next match, so that encourages people to play extra risky, making it more fun for everyone.