It's exactly what I made, an I didn't see any changes... now I see them unter "more colors"/tab templates
I'd suggest you to make a button to customize this, because I'd like that all my front-end editors only would use the permitted standard colors...
This way I wouldn't risk that they use ugly colors, and wouldn't need to eliminate totally the color palette
Thanks for this tutorial, and also for this https://www.joomlacontenteditor.net/support/tutorials/editor/creating-custom-styles
But I think if is possible to change the default principle palette with many own colours and not use the path of the template or custom styles.
Infact could be necessary to have not 4 or 5 personal style but twenty and the path "more colours"->"template"->"custom colours" is not immediatly.
So I say It is possible to modify this?
Clicking on Joomla Articles or "NEW Article", shows the fatal error page "Call to undefined method WFEditor::getInstance()"
I went back to 2.6 (most actual stable version), and the problem solved magically.
JCE 2.7.0 does not use or include a WFEditor::getInstance, and as all testing is done in the Joomla Article Manager, without generating this error, I suspect that an extension you have installed that is attempting to load JCE in some way is responsible for generating this error.
I have added the method back for the JCE 2.7.0 release, but you should attempt to find the source of the error, in case you encounter it again in future.
Just because you're not paranoid doesn't mean everybody isn't out to get you.