Imgur user White Sorceress shared a gallery of over 210 fantasy wallpapers. The entire collection can be downloaded from the link on the far left and arrives as a 123MB zip file.
A sample of the wallpapers are shown below. There is no reason to believe any skullduggery was used in putting this collection together. Many books, games and art projects give wallpaper art away for free. However, if you see an illustration below that shouldn’t be shared then please get in touch.