This is something I have played with on and off when building websites for clients. The idea is to provide a single unpublished post that can be used as style reference when writing their own posts. For the most part it is ignored and merely serves as a way for me to make sure I have covered all the bases within the CSS.
I am pretty sure much of this example was pinched from someone else but I have no idea where or when, so apologies and thanks. Please feel free to steel from here and let me know if there are elements which would can be added.
Paragraphs & boxes
Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
Full Width Images 670px
Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor sub text ut labore et sup text magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.