I'm finally jumping in on this full force. I realize there is not much time left but I will give it my all.
My two ideas are a lava, fire based lisandra ult.
Drawing a bit of inspiration from Lavaclaw Reaches, a Magic land card
and an Ice based cho'gath/ zyra q like effect.http://www.mmozone.de/wp-content/uploads/2013/03/Q-Spell1.jpg