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Illusion/Radiation for messy Aoe,... or Earth/Storm (my personal favourite) fantastic GFX/animations and stoney is of course an total 'Control Monster'. Both make cave missions an absolute joy. 
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Or Illusion/Storm for the really, really messy AOE. No-one on your team will know what's going on and neither do the mobs (they'll be too busy being Feared, Confused, Slowed, Knocked down, Blown about, Debuffed, hit by lightning and attacked by multiple glowie people).
There's not much actual synergy in Illusion/Storm (esp compared to Earth/Storm) but thats the joy of it really. The ability to summon lots of horrible effects and just drown the opposition in them.
There's a huge SG in the US who are built around the TP + Vengy + Fallout + Mutate combo, the Repeat Offenders. Basically if you go AFK in a mish you'll be TPed into a group and killed for the Vengy bait (everyone has to have TP Prompts switched off for this reason). By the time you get back the debts probably gone again...
would love to do that is i had 5 spare power slots