I want to paint Katelyn's room. Right now her walls are just plain white. Here's a pic of her bed I put little flowers that are removeable on her bed and walls

This is what her bedding is

I'm really not sure what to do. I want to put a mural on her wall but can't afford
what I had in mind...I want to paint it even if I do end up getting that...I'm just not sure what color to go with. I want a light color because when we move out I will have to paint white over it.