After experimenting with XenForo colour palettes for a few hours, I came to the conclusion I should rather spend an extra 30 quids on a Premium Style package instead of investing so much time customizing the XenForo Default Style which can be frustrating at times. I initially settled with one of Artodia excellent themes. I particularly like that Dark Responsive variant. In the download package you obtain after purchase you will find a readme file containing installation instructions which are fairly simple: Upload files to your XenForo installation via FTP or otherwise. Register an Add-on through Admin Control Panel by uploading a local XML file from package. Register the Style itself through Admin Control Panel by uploading a local XML file from package.