An excellent introduction that covers everything you need to know about CSS Regions at the moment.
If you want to know exactly what is the current status of CSS Regions (regarding W3C and browser implementations), I suggest you check out the following article: CSS Regions: One Year In
Pseudo elements, CSS3 transforms and box shadows used creatively to build a cool image stack illusion.
Very dirty (but still very cool) hack for achieving something with CSS that ideally should be done with JavaScript.
A fun and interesting experiment (but overkill outside of experiment context).
Final result might not be mind-blowing, but techniques used in this tutorial will help you create something mind-blowing.
Don’t be emotional about pixels. Embrace em Units. It will take your skills to a whole new level.
Image replacement techniques throughout the ages. Informative and useful demo.