Question: I'm looking for a way to create photo montages with custom backgrounds, is there a tool for that?

If you want to make photo montages with a custom background, PhotoScissors is a good option. It uses deep neural networks to automatically remove backgrounds, separate objects and replace them with new ones. It's good for collages and for hair and transparent objects, and you can set backgrounds to any color, including transparent. It can handle common graphics formats like PNG and JPG, and you can process images online or offline.

Another option is ZMO, an AI image generation system with a range of tools, including an AI background changer. ZMO has a good reputation for high-quality results and ease of use, so it's good for pros and amateurs. The premium version adds more advanced features, so you can get a fast and creative way to generate and edit your imagery.

Last, getimg.ai offers a powerful site for image generation and editing with tools like ControlNet and DreamBooth. It can generate high-resolution images and offers a variety of AI models for different tasks. The site's flexibility and powerful tools make it good for creating personalized images, including those with custom backgrounds.