Zilean and Olaf makes a good top lane. Ward the rear bush to prevent any exp camping, then just zone the enemy with bombs.

If you need to dive an enemy, speed buff, bomb and rez all on Olaf as he rushes in like a bat out of hell. I believe his ult persists through rezzes like Angel or Zilean rez.

Malzahar+Syndra.
Space AIDS a monster, chuck it at bad guy. Instant fun! Mal ult + Syndra bombs allows Syndra to deal maximum damage with her ult after mal's suppression. (If the enemy lives that long)

Malphite and Graves, for their initiate.

Malphite ult + Smokescreen into Collateral.
Whatever isn't dead, is now running for their lives

Ap Shaco and Blitz... Very trolly, hilariously fun.

I don't know if it was just luck the one time, but one time I was playing Cho'Gath, and me and a Blitzcrank were sharing a lane. Everything we did seemed to always mesh up with what the other was doing and we had near perfect synergy the whole game. One memorable combo we did was Rupture to pop them up, Rocket Grab to latch on and reel them in right into my Feral Scream to prevent escape, a Power Fist to pop them up and landing them right into my Feast for a kill.

shaco and blitz. set up a couple boxes in the bush, get blitz to pull one sorry adc in, and presto, profit.

Nocturne and TF.

Deny global vision. Grant other-team vision.

Alistar blitz? cc for days

lulu and rumble make great AP love :P