Seven Deadly Skins
So, for this skin line, each champion that best embodies that sin would get a skin based off of that sin. (Ex. Slothful Heimerdinger)
Gluttony: 
Kog Maw would appear mammalian akin to a pig. He would have a pig nose and hooves. His skin would be tangerine and fiery with a gluttony symbol on his tail. He would spew lava and fire.
Sloth:
His hair would be made out of cloud. He would have a bluish tint all around him. His turrets would be small blue ghouls riding clouds that shoot electricity. ULTED Q: His turret would be a larger ghoul on a black cloud that shoots bolts and has the sloth symbol on his forehead and hands. His rockets would be blue demons with streaks of cloud behind them. ULTED W: His rockets would be demons with dark blue clouds. His grenade would be a pillow. ULTED E: A giant bouncy pillow.
Greed: {{Champion:4}}
He would have yellow clothing similar to a yellow PAX twisted fate skin except for the fact that his hat has yellow flames coming off of it. All of his cards would have the symbol for Greed on them.
Pride: 
He would have a purple aura around him. He would have purple flaming blades and all of his particle effects would be purple. He would have a large golden crown with the Pride symbol on it.
Lust: 
She would have Pink particles with heart particles and flames for her tails. The lust symbol would be on her chest. Nothing much else to say here.
Envy: 
She would have a green blade that looks like a serpent. Her hair would be green and look like a serpent as well. She would have the Envy symbol on her forehead.
Wrath: 
He would have dark, cracking skin with lava coursing through his veins. His bludgeon would be a hellstone shaped like a weapon on a pillar. Horns would decorate his tiny head and large wings would make him appear to fly when he ults. He would be the king of sin.
All of these are priced at 750. I made most of these up as I wrote them.
s ?
(One for All Heptakill)
for Gluttony.
Orianna is a robot, thus she doesn't need to eat. She is also the thinnest robot. The theme of temperance is Restraint and Self Control, and playing Ori you control not only yourself but the ball.
Where Heimer can lay back and get free CS, Nasus has to stack aswell as CS normally. You have to be careful and can't be lazy.
You donate your Health to heal the carry, and spend money for wards. Honestly, Soraka could be any of the Virtues but this is the most appropriate.
The most humble champ in the league. ;_;
This was difficult but I feel that Akali would be the most Chaste of all female champs as Ninja's would usually be forbidden from any romantic relationships. Would have to have very covering clothes, as opposed to her other skins.
Who would not feel better after hearing Braum speak to them.
Weird right? But you have to be patient to wait for a good time to Ult and can't be ulting willy-nilly.
as Wrath? Or have a four horseless horsemen set with
(famine),
(plague)
Gluttony
Greed
Sloth
Envy
Wrath
Satan
Sloth:
I'm not really sure that Diana is the best choice for Envy either but I couldn't easily think of an alternative.
would have been a better envy character especially considering the shurima event and the whole serpentine thing you are going for on diana.
Pride
Lust
Wrath
Greed
Gluttony (soul hunter)
could be the same given that he desires to consume the worlds knowledge.