Eh, the background images in blender will not show is more surprising than the resplendent background images in blender will not show.
Blender background image is a free transparent clipart image selected by Jerk cliparts.
The resolution of the first clip art image is 1844 x 2058 px
and classified to Blender cycles transparent background, Blender render with transparent background.
Try search service at Jerk cliparts and you can quickly find more transparent background
images related to blender background image.