Save custom colors
Please add functionality that saves custom colors, for use with anything that can have a color set for it (shading, font, tables, borders, etc. - everything). The functionality is almost there with the "Recent Colors" sub-menu in every Color palette menu. Just make it like that but so that it can be saved, for example in a Word template.
You can do it through the Design tab. Once your theme is ready, click the Themes button > Save Current Theme.
For anyone who's also waiting for this feature, try this workaround:
Create yourself a color chart in Word, using text, shading, etc., and show the RGB/HTML color values. This can be a simple list, a table, anything. Select all of the information, go to Insert --> Quick Parts --> Save selection to Quick Parts gallery.
This is just one way to accomplish a workaround for making re-using custom colors easier. Just having the ability to save custom colors will be the best way.