We visit a hot springs nearby that has large murals of early americans "taking the waters" visible from the pools. It adds a nice touch. It would be nice to amplify how much fun a pool is for the youngsters and perhaps how healthfull a pool is for the oldsters.
If you get some nice designs going you might shop them around to other vintage water places. Here is one out in the wilds of montana, probably not in their budget but you never know. http://www.boulderhotsprings.com/