Lyra and Bon "Sweetie Drops" Bon or what have you. (I used "Sweetie" in the working file title, and honestly it has begun to grow on me...
) In my vision, Sweetie/Bon would dress like she shops at Forever 21, and Lyra would dress...not girly, but not un-girly either. Utilitarian with a little flair of her own. (Sorry, no gangsta hoodies plz.)
I aimed to make the overall feel as girly as possible, because there isn't enough girly FIM art. Hand-drawn pastel hearts, flowers & etc. are hand-drawn toward that effect. Deal with it.
[Edit: Now I've drawn them as Equestria Girls too, 'cuz these two are the best!