If you want to make your own custom socks with a custom design, Petals is a great choice. This AI-powered clothing design tool lets you create custom clothing, including socks, by uploading photos that are converted into custom designs with image generation models and processing algorithms. You can refine the results to your liking and save or share your designs, and you can keep your personal photos and designs private.
Another option is Xinva. It's got plenty of design options, including t-shirts and patterns, but could be useful for people who want to make high-resolution prints. Xinva offers tools like auto background removal and multiple pricing tiers, so it's a good option for people who want to brainstorm and create designs without having to hire a designer.