If you're looking for a tool to create realistic sprites for UI and backgrounds in your game design, the AI Game Assets Generator is a great choice. This tool uses AI technology to generate game assets, including characters, props and backgrounds, based on natural language input. It can generate realistic sprites and character design ideas quickly, letting developers focus on the creative work.
Another good choice is Leonardo, an AI image generator geared for high-quality visual assets. It can generate a variety of styles from anime to photorealism. Leonardo has features like AI Canvas for fine tuning designs and 3D texture generation, so it's good for game assets and concept art.