Once you've got the scraper set up correctly, and your sources set to tell Kodi the type of media that folder contains, then any of the skins available will show the cover art.
I personally prefer and therefore use Aeon Nox - but any of the skins available from the official Kodi repository (through the Add-Ons menu) are there because they are essentially validated to work correctly with Kodi.
I personally prefer and therefore use Aeon Nox - but any of the skins available from the official Kodi repository (through the Add-Ons menu) are there because they are essentially validated to work correctly with Kodi.