How about swapping Gangplank's Q and E icon?

Then Parrrley will show you shooting someone form behind, and Raise Morale is Gangplank's flintlock firing.

And another idea would be Warwick's Q and R. His Q pictures Warwick clawing an armor, while the description says that he "takes out a bite" from the enemy (Current Infinite Duress shows his face baring fangs). While Infinite Duress is him clawing an enemy to death.

Just some fun thoughts. I would like to have Raise Morale's awesome icon as a Q. It looks really nice!

Ps: Raise Morale's old effect was a deny, that's why it shows a target one someone's back. Because you killed your own minions.