Eleventy is not only a Jekyll replacement, it comes up with great new feature as a site generator. It supports multiple template language (.md, .ejs, .pug, etc.), highly flexible and good integration with multiple source of date (API, file).
If you plan to use Eleventy as a static site generator for your next blog. You'll eventually consider to implement from scratch. Or, if you want to save time you should use a pre-made theme. And here, you'll able to find my short list of Eleventy Themes in 2021.
These themes are truly valuable and make it easier for you to build a blog.
A responsive and clean theme perfect for your blog or portfolio. A minimal first theme with no frills.
Minimal Eleventy theme - More info
A modern and simple theme. On the homepage, a card grid with image and on the post page, a classic two-column.
Modern Eleventy theme - More info
Awesome responsive two-column blog theme with blue as main color.
Portfolio Eleventy theme - More info
Dark Eleventy theme - More info
The only dark theme of the list. For all pages, you'll will have one column for the content and another column for the sidebar.
I'm the author of all 4 themes. It all comes up with Tailwind CSS, lazy loading images (lazysizes), syntax highlighting (prism.js), HTML and CSS compressor (HTMLMinifier and cssnano). I've built these 4+ template with minimal code, SEO-friendly and Production-ready in mind.