Disco-tech Orianna
I'm not much of an artist so I'm just writing out what the skin would be like.
Her ball is a disco ball.
(Q) Command: Attack -- Its just the standard move animation with new particle effects.
(W) Command: Dissonance -- the particle effects that expand outward from the ball would be neon lights similar to this picture: https://imgur.com/7I3tbJr
(E) Command: Protect -- Orianna's shield would look like a disco ball
(R) Command: Shockwave -- A Phonograph record would appear under the ball and the record would spin with the ult