Go to Video add-ons and then SALTS, don't go in just hover over and press the menu button on your remote. Now click add-on setting and on the top menu bar look for Artwork Scraping and check here to see what needs to be turned on.
Plus if you now go to system and add-ons and install from repository, go to tknorris release repository and click here and then programs add-ons. Here you can install SALTS themepac which after it installs allows you to change the background colour and look. You can also add the one for 1 channel (Primewire).
How they work is after you install the themepac you then go to SALTS and then add-on setting and General and just below Add-on theme and change colour of the add-on.