Fire Style: Shadow Clone Explosion
You create thousands of clones that when destroyed in combat explode in your opponents face
Leaf Massacre
Create clones that do rapid taijutsu attacks like Dynamic Entry, Leaf Hurricane Leaf Whirlwind and a bunch of other taijutsu based attacks and then finish them by doing the Shadow Clone Explosion
Water Style: Water Dragon Barrage
Create Water Clones or Shadow Clones to a lot of Water Dragon Blasts
Earth Style: Ultimate Earth Blast
This would be especially good with clones but it can be done without the use of clones, but it creates large tsunamis of dirt and mud that trap the foe and contain them, and then shoot spikes of Earth at them
Naruto's Secret Jutsu: Kyuubi Cage
A technique only used by Naruto, He seals his enemy inside himself, but also in the nine tailed fox's cage to have their body, soul and chakra devoured by the fox and added to Naruto's own orignal chakra storage for any time use
Sorry for all of the clone using techniques, but clones are a good basis for any jutsu -_-
"I am the Greatest"