Grey Warwick and Medieval Twitch splash art
I think when their splash art gets updated they should have a combined art piece with Twitch shooting at Warwick from a castle tower. I think the skins having a shared splash art would work in reference to both skins being originally earned from Refer-A-Friend [I didn't play LoL at the time so I never got the skins but I want them!] If this was done they could do some sort of splash border for those that originally earned the skins like the original PROJECT skins.
I want Riot to find a way to brings the skins out of limited, maybe through a temporary event or low drop rate in hextech. Maybe even make an official LoL Tumblr or something and make it earned like Riot Girl Tristana or Dreadknight Garen.
Also: As a Twitch main I find it frustrating that so many of his skins are just not easily accessible and that his highest tier skin is 975. He needs some love in the skin department in some way or another.