Just testing out the Jekyll system...
A post to test author overrides using a data file.
Demo post displaying the various ways of highlighting code in Markdown.
Custom written post descriptions are the way to go... if you're not lazy.
Examples and code for displaying images in posts.
A ton of text to test readability.
Just about everything you'll need to style in the theme: headings, paragraphs, blockquotes, tables, code blocks, and more.