Perhaps jars that contain elements of clouds?

Photographer: Amy Cameron Evans
I know I'm drawn to book covers that seem energetic and have motion combined with cool textures. This may need a more blue background color for me to be serious about it but I love the whimsey here. Just trying to find different ways to express Cloud Pharmacy in an indirect manner. Thank you for all the comments. I'm following every lead you are kind enough to send to me.