With the September 2017 update for Power BI desktop the major feature enhancement was the addition of Report Themes.  This is a game changer for the advanced Power BI user.  Changing themes and creating custom themes has never been easier, with the exception you must know how to write it all in JSON.  In the expandable accordion windows below are the available settings for the third iteration of the Color Theme Generator.  Enjoy!

Instructions

1. Open up the various accordian sections below. Each section is labeled by visual type.
2. Change the properties for the visuals you want to change.
3. On the left side of the screen click the download button.
4. A file will be downloaded to your computer containing all the Report Theme with proper JSON formatting.

Still like the older versions of the Advanced Color Theme Generator?

Follow these links for Version 1 and Version 2

General

Settings that control all visuals

General: Modify all General sections at once

Plot Area: Modify all Plot Area sections at once

Thanks for taking a look at the New Report Theme generator.
Stay tuned as I am updating the tool as fast I can.