Welcome to xF! I moved from vB to IPB as well when they released that shoty thing they called 4.0 Suite... I really liked IPB and the community and bought a xF license to show support... it didn't take long for me to get hooked on it and converted my community a couple of months ago.. So far I have to say me and my community love xF and really don't miss anything we have left behind..
Again, welcome to the community, it's a great bunch here!
Mind you that quote box is sort of peach coloured. Not really pink so not "girlie". Perhaps "slightly butch girl who isn't entirely comfortable with her own identity" then. Though that's a bit of a mouthful.
The colours are a little more subtle which may have prompt the comment for the "girly feel" it's def not using the bold strong blues you see in ipb or vbulletin just that xenforo went down the subtle coloured route which I prefer.
Nothing to do with different colours just more the variation of that colour.