Tool for replicating cover style

I have two new covers coming from a great designer, but I can't really afford to commission an extra one for the prequel short story I use as a reader magnet. Does anyone know of a tool (or a prompt for a tool) that can generate cover art similar to another image to use as a background for a separate cover? I'd like my short story cover to look branded with the others, although it doesn't need to be exactly the same. I know Thomas talked about MolyPix.ai from AppSumo, but that tool is sold out now. Image generation is still a bit beyond my comfort zone…