Oh no I now have a new hc for Rainbow's hairstyle. Would you mind terribly if others used this idea?

It suits her really well and second the motion of the other characters (particularly the mane six or princesses, especially Rarity).

Perhaps you could consider Trixie, Starlight and Luster? Really excited to see who you decide to go with for the short hair trend, but honestly I love your art style so I don't doubt I'd enjoy anything you draw.