Here is a lazy macro I did for another friend. Starts with shield yourself and spams Frostbolt, hold a modifier for Frostfire and pops all cooldowns.
Macro might be outdated, please check the forums for up to date macros.
/castsequence [mod]Frostfire Bolt;reset=30 Ice Barrier,null /castsequence Frostbolt /castsequence reset=120 Mirror Image,Deep Freeze,Deep Freeze,Deep Freeze,Deep Freeze,Deep Freeze,Deep Freeze /cast Icy Veins /cast Flame Orb /use 13 /use 14
UPDATED July 7, 2011: Reword code for no lockups and added Frostfire Bolt with modifier. Removed Deep Freeze version since is combined now.