I tried to implement it, but I found two problems that I think is due a problem with new wordpress version. The first one, in the file custom_admin_branding.php in the line 162, I have to change the way as it get the url of the site for the include of the ColorPicker.js, so I change this:
<script type=”text/javascript” src=”<?php echo $site_url; ?>/wp-content/plugins/custom-admin-branding/js/ColorPicker.js”></script>
with this:
<script type=”text/javascript” src=”<?php echo $site_url; ?>/wp-content/plugins/custom-admin-branding/js/ColorPicker.js”></script>
The second problem is that the plugin doesn’t include the js file of thickbox. And here I’m stack, because I added it manualy, but is still not working. I’m working on it, if I can solve the problem I will let you know. Although it will be great if the author give as support.