You have to load it into Kgpanels yourself.
To do so, do not extract these textures in your kgpanels map, because they will be gone when you update kgpanels, create a folder instead, name it whatever you want, i personally use kgart.
Then enter game, type /kgpanels config and click on Art library.
There you enter the name of the artpiece first, and then in the line under that, you put \\Interface\AddOns\<yourfoldername>\<artpiecename>.tga
So if you use mine called blue and you use the folder kgart, it will look like this: \\Interface\AddOns\kgart\blue.tga
When you did that click on backgrounds and search for the piece you added, if you did it correctly you will see a preview, if you dont see a preview either reload your ui or doublecheck if you have not made any spelling mistakes.
That should do it, Have fun
Due to the growing amount of artworks i have added Previews of the nontransparant pieces in the file
Added 4 new pieces of art.
Added new textures with transparant background.
Added 3 swirl textures.
Removed the art i thought was not pretty enough/ugly.
Added some new pieces I have not created myself.. I just converted them to use them in wow.
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