I need some ideas!

I wanted a purple and turquoise nursery, but my husband HATED the set I picked out and any other one I found in either of those colors, so we ended up choosing this one:

And this is our crib:

I’m struggling on a wall color, and with what to put on the walls. I originally had some Little Mermaid watercolor prints that matched the original set, but those won’t match it now. Please leave any ideas or suggestions you have! We haven’t actually bought the bedding set yet, so there’s still time to change, but he kind of has his heart set on that one.