CSS color changing and saving tutorial?

Can someone please create a tutorial showing me how to change some colors on ES like the tool bar and some buttons? Then show me how to save the changes in my template override folder so i won't have to do it again when ES has an update. I have extplorer already and made a change to the email logo thanks to @RandallM tutorial. I know this will take up someones time but i would greatly appreciate it!!!! SOMEONE PLEASE HELP ME!!!!!