You can add your own CSS for the CMS by adding the following to the MY_fuel.php config file $config['xtra_css'] = array('my_admin.css'); where mY-admin goes in the ./assets/css directory. Each CMS icon has it's own class so you can easily override the images by editing your CSS file. I guess you'll have to experiment with how you could implement font-awesome icons since they're font characters using markup whereas the Fuel icons are images. You might be able to do it just in the CSS
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$config['xtra_css'] = array('my_admin.css');
where mY-admin goes in the ./assets/css directory.Each CMS icon has it's own class so you can easily override the images by editing your CSS file.
I guess you'll have to experiment with how you could implement font-awesome icons since they're font characters using markup whereas the Fuel icons are images. You might be able to do it just in the CSS