Well, personally, I am in LOVE with the existing, "Young at Heart" style. It's just so vibrant, colorful, fun and a little unexpected. And it manages to pull all of the other colors in the room together without being over-powering. I also just love the message!The "Edgy Surprise" look is really interesting as well though. I'm not sure the color palette is quite right for that space, but I think that style could work really well!
I love the Lulie Wallace piece there...but that may be because I adore her work. I can see the piece by Kate Merritt Davis working really well--the Elegantly Playfu. The elephant is amazing, though! What a fun sense of style!