Holyknight3000 is a fan wallpaper artist, who made him self first known a few days after the Diablo 3 announcement on July 1st with his first wallpaper, which was a screenshot of what we now know was Diablo.
He went on to make the Fiery Runes Series wallpapers, a popular series which is currently in its third series. This series didn’t really take off until he spent 5 hrs making the Female Witch Doctor wall art which he only used screenshots from the WWI: 08 Concept Art Trailer.
That also later started weekly fan wallpaper news posts by Flux called Diablo 3 Weekly Wallpaper.