> But still, they were nice because you knew someone took the time to create them to promote an event
Unlike a gift, "it's the thought that counts" doesn't fly with me here. I don't care how much effort the secretary took to cobble some shitty poster together - it still looked terrible. I'd rather look at something clean and polished produced by AI (no matter how "generic" people here claim the OP's posters look).
Prompt1: generate random poster
Polish: make it nicer