I'm very excited about the ability to "theme" the HTML output using relatively simple CSS files. Planbook ships with a default theme installed and you are encouraged to experiment with the included theme (make a copy first, please!) and develop something that you find functional and visually appealing. If you would like to share your theme with others, please e-mail me a zipped archive of your theme and I'll post it up here for all to see (and, of course, you'll be credited with as its author!).
If you are interested in developing themes for Planbook, please read the Theme Creation Guide (PDF) and take a look at the comments in the CSS files used in the default theme.
To Install Themes: Please download the theme you would like to install. Unzip this file and note the location of the resulting folder. Open Planbook, go to the "Publish Options" menu item in the "Publish" menu. Below the table of themes there is a "+" button. Press this button and select the folder of the theme you would like to install. The theme will be copied to the correct location and will be added to the table for you to select.