I was thinking about designing posters with unique themes for the project. Can anyone recommend an AI that generates visuals that I can customize to my own ideas?

So if you are looking for an AI tool that allows you a different themed visual, Try out Image Generator. It is super easy to use, and you can create designs based on your ideas — which is ideal for posters that need to be customized. I used it for a community meeting and it was not just unique but very professional.