I will take the note, Hex girls from Scooby - I like that! what about jen and holograms, that looks great, but I don't feel like a pinky colors and that kinda look will work the way I want.
Maybe cause of the witchy feel you could draw inspiration from the Hex girls from Scooby doo for the rockstars theme Or maybe look at Jen and the Holograms (I feel like Soraka would go with bright colors)