OMG, Ice/Bug. I had created a base 600 pokémon with this type. An Artic moth, Himath (crappy name, kill me), with Levitate (duh) and an Ice-Type Flash Fire. I remembered I gave her BoltBeam, Nasty Plot and Baton Pass (yeah, maybe a little broken), and her stats were Garchomp's, but special-based. Himath's weaknesses are as many as Tyranitar's, so that's why I decided giving it 600 Base and a huge movepool would balance her.
Even if I think Ice/Steel would be a great typing, I'm going to vote in Bug/Ice. Gogogo, Himath.
Lol, I even gave her Rapid Spin, Swords Dance, Ice Shard, Sheer Cold, Spider Web and Mirror Coat. Was I crazy or what.
EDIT: Gah, I gave her an Ice-Type Overheat, Whirlwind and Agility. Am I an idiot or what.
And there are all the other pokés I created... God, I'm surely being an active member in this Create a Pokémon topics.