Are there any cool funky Themes for Notebooks



Could you please let me know what are some cool themes used with Notebook. I just want to know apart from the basic themes that Rstudio provides what are some cool themes that you have used and what are some good packages which I can use with notebooks.

And could you please mention those which are specially meant for notebooks live preview.


Some additional themes:

Creating Pretty Documents from R Markdown - The prettydoc Engine and html_pretty