Experimenting with various shades, you have to include the entire RGB colour range whilst never using the same colour twice. The challenge has already been accepted by 36 artists, and there are almost 100 images to browse through.
We're hugely impressed by the time and talent it must have taken to produce a number of these pictures. Some are beautifully surreal whilst others are wholly realistic - either way, an incredible feat in meeting this odd little challenge.
See more images over on the allRGB website.
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Could you create an allRGB image? Let us know in the comments box below!