Lexica
Lexica is a platform that serves both as a gallery and a toolkit for AI‑generated visual art, especially built around Stable Diffusion. You can browse a vast, searchable image library powered by user‑generated content: each image is paired with the textual prompt that created it, so it’s both a source of inspiration and a way to learn how good prompts work.
In addition to being a prompt discovery engine, Lexica also includes its own image generation tool (Lexica Aperture), letting users enter descriptions and parameters to produce AI art themselves. Free usage is available (with monthly image budget limits), and there are options to adjust things like image style, aspect ratio, and other generation settings. The interface keeps features like “history” and “favorites/likes” so you can organize your work and return to things later.