You could use a UV or Skylight filter and a Sharpie felt pen and put concentric rings of dots all round or leave the center clear. Use black or silver, different effects.
Same filters and Testors clear model paint, concentric or radial. Add just a drop of silver or gold to increase the shimmer.
a fixed-out sheet of Tri-X.
Bubble wrap.
Have fun playing with it all.
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