I hope this game helped demonstrate that the modern perception of 'Atomic Fleck' is inaccurate.
While certain flecky fabrics were popular during the 1950s, those and similar fabrics predate the 'atomic' era. Actually, very few if any primary sources from the 1950s actually call 'Atomic Fleck' by that name.
Even so, the name and category of Atomic Fleck is in common usage today and can be very useful in defining and expressing a particular fabric pattern from a specific time period. Unfortunately it is often unknowningly misused to describe pre-Atomic Fleck fabric patterns.