Skins Concept! =D
Class has been boring lately so my thoughts just wonder towards League, these aren't well thought out, maybe I could paint some of them and think them out a little better but for now this is what I got.
Note : I will be posting more if I think of more, or if anyone comments an idea that I think would be really awesome to be added into League =D Note 2 : The first post was deleted on accident xD.. Thanks to Curator for reassuring that this is on the correct board ;3 Psst Forgive me for how terrible it looks... First time posting something on any forum xD..
Snowstorm Yasuo ( or Winter Wonder?... Lulu and Sivir? )
**[ Q ] ** Snowflakes falling off of the blade ( Crazy simple but I think has pontential
[ W ] Snowball fight walls ( The walls you hide under made out of snow during a snowball fight... Don't know if anyone still does that but... yea xD 
)
[ E ] Snowflake trail as Yasuo dashes through units ( Like Q, simple but I believe could look very nice )
[ R ] The enemies that are caught in your ultimate, go through a violent snowstorm. Bonus Armor Penetration - Instead of wind flowing around the blade after your ultimate. Ice freezes the tip of the blade?
Infernal Nunu
[ Q ] Fire-ish particles ?.. ( Not sure... Don't have an idea for this one.. )
[ W ] Possibly looks the same as Infernal Nasus W?
[ E ] Fireball? ( Herrr Derrr I'm so creative right? )
[ R ] Kinda like Infernal Nasus E, but of course bigger and Nunu gets encased in a orb of flames while channeling?