The first prompt I gave to the art group I frequent was successful enough that they haven't needed another one since! (Yes, that is the appropriate way to interpret events.) Which means this one I brainstormed tonight won't be needed. So I give it to you. You need something to create around and this should work.
"Summertime" is the name of a number of great songs. Here are two of my favorite (recommendation --- just listen --- don't let the images define what you create):
Or, if none of those do it for you, here are some more.