If you're looking for an alternative to Background, Impossible Images is another good option. The site has a broad library of AI-created stock photos and an accessible AI image generator. You can use images royalty-free for personal and commercial projects, and you can also commission custom images based on prompts. Pricing is on a sliding scale from free to £50/month depending on your needs and budget.
Another option is BgRem, which offers a variety of tools for creating and editing high-quality images and videos. That includes background removal, photo-to-painting conversion and AI-created illustrations. The site can handle many file formats and has an interface that's good for pros and amateurs. Pricing is by credit, with monthly and one-off subscription options.
If you want something more open-ended, AixStock has a large collection of AI-created images across categories like Nature, Decor and Architecture. Each image is well annotated so you can search for inspiration for your creative project. Commercial use licensing varies, but the site's interesting collection and growing catalog of images makes it a good option for designers and artists.
Last, getimg.ai offers a variety of tools for generating and editing images. That includes an AI generator for text prompts, an image-to-video converter and a variety of community-trained models. The site is good for a variety of tasks and offers high-resolution image downloads, so it's a good option for those who need high-quality, customizable images.