We just launched a new visual skins editor that allows you to edit your CommandBar theme more easily. It's an intuitive UI to change the look and feel of your Nudges, Questlists, and Bar.
Previously, we listed all theme attributes together, line-by-line. Now, for most styles, we highlight the section of the Bar or component that is being updated. Here's an example:
This should make it much easier for you to change your existing theme or add new ones. Note that there are also sections for Nudges and Questlists at the top. Let us know what you think.