Just download the art you want to use and install it like any other addon. When you log in to WoW, click the addons button, scroll down until you find the new art mod and enable it. Most are disabled by default since you can only "use" one at a time.
You can use different art on different characters by using the character dropdown in the addon window and selecting the toon you want the art to be used on. Then enable the art and it will only appear on that one toon's UI. Then you can choose a different toon from the dropdown and enable a different art background for that toon, etc.
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