Spicing up the Pentakill Skins? (Just a teeny tiny bit)

Hey there guys! As the title suggests, this is about the pentakill skin lines. They are reasonably cheap skins, so giving them massive changes would be way over the top. These are just an idea for each champion for an animation change that would still be within their RP-worth:

Sona: The animation missiles keep their colours but the style is more in spiked chains than flowing notes.

Yorick: His W becomes a pit and the walls are ghouls or souls just head-banging to some imaginary music.

Olaf: Everytime his Q hits an enemy, you would hear the sound of a bass drum (da-dum). When he picks it up, you hear the sound of a hi-hat or symbol (higher pitched Tssss). Either that, or his E would be the hi-hat sound and whenever he activates his W he could shout "Rock On!"

Karthus: The outside posts of his W becomes microphone stands and his W wall would be playing notes that move left-right in some style or another (colour remains the same)