A photo of sunlight split into spectra was the source image for this Liquib
example. The Bloom Tool has been applied multiple times with the Petal
Shape set to Captured Stencil, which bases the Petal shapes on
stencils created according to the relative lightness/darkness of the source image.
Also, the Bloom Style was set to Cloned From Image, causing the
Petal contents to be copied from the source image.