Started playing with the new clouds just now, and decided no to try the conventional use for a cloud.
So I made a simple, small, localized cloud, ant set the sliders for edge sharpness, coverage adjust and density to max.
Added base wispiness, and then inverted the profile.
The result is a sort of cloud pebble.
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After that I put a light in it and turned off the sun.
I think the shadows from the voxels in combination with the starburst and bloom effects create a diamond like sparkle, or a star nebula depending on the light's strength.