Say you have an item against the wall. A backlit background could greatly improve your wearable presentation.
You can download the image used in the example above here.
Or to achieve this effect on your own, you will need an advanced image editor such as GIMP (open-source) or Photoshop, and create a gradient of black and white.
Insert you image in-world and resize it as you wish.
Blend mode, select
screen to invert the colors.