Under the cog wheel at the bottom of the Color Wheel Pane, Choose "Save Style As" and give your style a name.
This saves the page you are on, exactly as it currently appears, in terms of color selection and other settings, as a new "Theme Style".
You can then access your new Theme Style under the little folder next to the cogwheeel. The new Theme Style will only be available for just that copy of that theme. It cannot be used in other themes.
This function is useful if you
1) have a look you really like and think you might have future use for it. Or
2) if you think you have gotten the look exactly as you want it for this project, but are not quite certain and want to do some more tweaking: Save what you have as a new Theme Style, do further tweaking, but now you can easily revert to your saved style if desired.
Note however, the new Theme Style will not automatically update to include future changes you make on the page: you have to re-save the style as you go along if you make further improvements that you want to incorporate in the saved Theme Style. You can of course, save as many Theme Styles as you like and select amongst them later!
Now for each page on your site, you can choose your Theme Style under the little folder, but again, keep in mind that any changes you make going forward will not be shared amongst the pages.
If you want to make sure all changes are inherited/passed to all pages as you go along, you can set the look of one page in your project to be the "Master Style" for the project and then elect to have the other pages adopt the Master Style.