Hamstr+Cleave = hamstring up to 3 targets - Piercing Howl (talent)
MS+CS = free slam/whatever - Overpower proc from MS (might as well be free)
WW+Heroic Throw = spinning weapon that AoE's as it is thrown - Ravager (new lvl 100 talent)
MS/CS+HL= arching attack when you land on nearest target (basically just more dmg) - +Dmg on HL was removed from Death from Above glyph in 5.2
WS+BS+WS= increased attk speed - Flurry
HT+Shattering throw (Hammering in the nail) = ignore all armor for x seconds - Colossus Smash. Two would be way too OP (but awesome)
Cleave+WW+charge= autoattack/HS targets inbetween your path to target - A damage all in charge's path ability would be cool
OP+HS= reduces CD on abilities on CD by x seconds - Readiness stat!