Eh, I applaud your thinking, but I personally feel like the Arlight/Justicar skins are just so bland and blah. They're not that creative in my eyes.
I've seen KateyKhaos get absurdly excited talking to players when they bring up the concept of Arcade Zyra, and doing the whole pipe/block piranha plant motif for it. I'd not be surprised if we potentially see this in the future. Zyra would also do REALLY well with a Voidborn skin, which would pay homage to at least one of her inspirations, Kerrigan of Starcraft, and she would also do rather well with a Heartseeker skin.
As for Cassiopeia, I feel like Bioforge would work very well for her, as would Elderwood or whatever enemy line they plan for the Star Guardians.
For Viktor, I honesty don't play him enough to care, but he'd be kinda interesting with a Program skin.