(Going to go with FUNimation-esque names for these, so sue me.)
Nami begins to use Rain Tempo, then begins cooling the air with a flurry of cool balls, forcing the rain to freeze and become snow. Next, she uses a special device she picked up in Weatheria to force wind to blow the snow around, possibly so that all of the ice and snow encompasses the foe or foes in the area.
Usopp fires a Lead Star at an opponent, however using a dial to charge the Lead Star with a small amount of electricity before firing. This would cause the normal damage of a Lead Star, but with the added effect of temporary paralysis to the attacked area, Damage amplifies in range if the attack hits metallic objects.
Coup de Breath
Franky utilizes the power of Coup de Vent and/or Coup de Boo via his mouth rather than his arm cannon or his butt. Causes slightly less damage, but is useful when he has no alternative.
Brook starts playing ominous music on his Violin, hoping to lull the opponent into a sense of fear before running them through with his Shikomizue.
Diable Jambe: Super Size Firebird Shoot
Sanji prepares to kick the opponent using Diable Jambe when Usopp launches a Firebird Star. As it is launched, Franky uses Fresh Fire on it to increase its size and ferocity. Finally, Sanji launches his kick so that it lines up with the Super Size Firebird Star and hits the opponent with amazing power.
Six Verse Humming: Lion's Duet
Zoro prepares to use Lion's Song (Shishi Sonson) while Brook prepares to use Three Verse Humming: Arrow Notch Slice (Hanauta Sanchou: Yahazu Giri). They both strike similtaneously in an X-formation and, before the opponents know what hit them, Zoro and Brook sheath their swords before all enemies in their path fall.
That's all from me for now, I guess.