A few suggestions
I was going through the champs and I just thought I'd throw out a few suggestions (I'll be skipping over champs with new skins). Don't sugarcoat your opinions please.
Mordor Vel'Koz: A floating brand Escaped convict Jinx: I know she's never caught, but I think it'd be funny if she intentionally got caught just to escape. I can't think of anything for Yasuo ATM, but he needs a new skin. Maybe fencer? (would be good on yi too) Hubba Bubba Zac: An assault on the eyes! Lightslinger Thresh: (or whatever it's called) is a good idea imo Praying Mantis Kha'zix: Give him a halo for kicks :P Leviathan Nautilus: Not sure how it'd work but it sounds great Samus Jayce: 's brother? Or Samus Trist (would look super funny but awesome) Ghostrider Hecarim: Too close to his halloween skin? (would be cool on thresh too) Warring Kingdoms Voli: Does that not work? I don't read wiki's Zeus Voli would be cool too. Assassin's Creed-esk talon: Something in white King Black Scarner: Because that's the only scorpion I can think of right now. Pool Party Orianna: Because she needs (imo) happier skins Deku Maokai: Because who doesn't love Zelda? Steve Irwin Nasus: LOL Karma needs a new skin but nothing comes to mind Mountain Trundle: Some sort of snow skin like in Skyrim. By that I mean he's white. Akali needs a blue skin, but nothing comes to mind atm Bigfoot Nunu Eclipse Leona: Make it happen riot Back to the future Zilean: Unfortunately it's not my idea but I love it Sephiroth Kayle: Super awesome custom I'd love to see made into a real skin Captain Gangplank: Blackbeard style Mechanivia: Would be sweet S for Shaco: V for Vendetta inspired skin Gargoyle Galio: Because I just watched Beauty and the Beast Debonair Taric: How can you pass this up?
That list is a lot longer than expected, but oh well. What's your favorite?