what stand alone skinline do you want to expand next and make it a themed skin?
For me its Neon Strike/demon Vi, we need some of this and chemtech tryndamere. Another is the sakura skin line, imperial skin line and dreadknight/full metal/forsaken skin line.
Speaking of skinlines; I wish commando and crimson elite will come back plus some gemstone skins ( Bloodstone skarner lol)
BTW, What stand alone skinline do you want to return?