Bureau Courier
For this new blog theme, I worked with only one font in regular and italic, in one size and three colours, no icons. As if I was using a typewriter with a three colours ribbon.
It's probably not the most beautiful blog there is, but it's a very good exercise to work within such tight contraints and see how you can convey structure and meaning without the “regular” tool set.
This theme is available at the 1200px to 1210px width, using the browser window as a switch between themes. I'll probably adding more themes this way later.