Project vs Pulsefire vs Battlecast vs Mecha
I really like the idea of having story or lore for the different skins.
I don't know if there is already a set lore or something, but I think it would be really cool to have PROJECT vs Pulse Fire vs Battlecast vs Mecha. We would of course need more Pulsefire skins, or possibly changing the names of some (Pulsefire Jayce instead of Full Metal jayce).
A cool idea would be Pulsefire Quinn, with Valor being like an advanced predator drone.
PROJECT skin line are obviously like AD light bruiser or Assassins (I would expect a PROJECT Jax, PROJECT Talon) Pulsefire skins would be more marksmen-ish (if you change Jayce). Maybe more Demacian and Piltover based. Battlecast is essentially Void monsters "upgraded" by Viktor, who leads them (Include Urgot even though he isn't Void) Mecha is so underdeveloped (like Pulsefire). There is only Aatrox, Malphite and Kha'zix... However you can see Rumble in Aatrox's art, Heimerdinger and Ziggs in Malphite's art.
If you go out on a limb, you could say that the Rumble in Aatrox's mecha art is Super Galaxy Rumble, and you could have a Super Galaxy Heimerdinger and Super Galaxy Ziggs.
I think lore for these skins, and the alternate world or future should be expanded and embraced. There should be more conflict, and more war between the different factions.
EDIT:.....I would love to see a conflict or something between "Blood moon" skins vs "Warring Kingdoms" skins