I'll start out:
Luffy: GOMU GOMU DRILL: LIke gomu gomu spear, but with his legs twisted together and untwist upon contact
GOMU GOMU cymbals: Luffy stretches his arms reaaallly LOOOOOOOOOOOOONNNNNNNG and clap them back together around somenone's head
GOMU GOMU hook: extends an arm like gomu gomu pistol but hooks around and punches someone in the back of their head
GOMU GOMU package: Wrap self around enemy to immobalize him, then start crashing into walls, trees, fall off cliffs to do damage, but remain unharmed as you are the rubberman!
GOMU GOMU Whirlwind: Have torso twisted several times, then release, throw punches and headbutts while untwisting and spinning at incredible speeds