The author of the post has created a free resource called JAMstack Themes, which lists hundreds of themes and starters for JAMstack sites. The idea for this resource came from developing Uniform Themes at Stackbit, where the developer noticed there was no centralized collection of themes for static site generators. To build JAMstack Themes, the author considered factors such as the site archetype, data sources, key functionality, gallery archetype and categories, theme submissions, content types, interactive filtering, choosing an SSG, starting development, generating GitHub data, creating images, building a pipeline, Netlify deploy previews for PRs, and wrapping up. The author chose Hugo as their SSG due to its robust taxonomy support, first-class categorization, and tagging features, as well as its ability to work with zero dependencies. The site uses a range of scripts to generate metadata from the GitHub API and create screenshots, which are then used to generate thumbnails for the themes. The pipeline is designed to be run by Netlify as part of the build process, allowing for efficient deployment and validation of the site's content.