Wallpaper to suit adults and children using a room?

[RamblinBoy]

I just wondered whether anyone had any ideas for wallpaper to suit a room used by both adults and children? So fun, but grown up? Bright but not garish maybe?

We have 2 rooms like this:

Family room - used half as a playroom/toy explosion, and half as a TV room for grown ups.

Guest room - DS(6) is going to try moving to the guest room but I'm concerned he won't like it and will move back to sharing with his sister, in which case it will need to go back to being the guest room.

Any inspiration?

Cockatoos. I'd love a wall to put this.

www.designerwallpapers.co.uk/osborne-little/zagazoo/cockatoos.html#multi-colour-wallpaper-tint-7

We just have paint in the playroom. Something neutral would work.
Laura Ashley Lille comes in different colours as is a very neutral paper.

What about a plain stripe, halfway up the wall to the ceiling and painted underneath?

Thanks for the ideas! Love that cockatoo paper 😍