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browser).
When you have Firefox and Greasemonkey, click the install button at the top right of this page.
Click to confirm that you wish to install the script, and it will be installed.
Now, when viewing any page on Facebook simply go to 'Tools', 'Greasemonkey', 'Userscript Commands...' and then 'Customise facebook colours...'. See the image below for help with this. (Alternatively the same menu can be shown when right-clicking on the monkey on the bottom right).
Select the colours you'd like facebook to be, click "Set!", and you're done!
Below is a screenshot of where I have picked a pink and black theme, but you can
pick any colours you wish.
Customise colours by selecting the menu shown below (whilst you're on a Facebook page);
And pick colours using the box that pops up;
Changelog