Slightly random colour range over a series of multi cell fixtures

Is there a simple way to set the cells of a range of channels to semi-randomly selected colours  chosen from within a range (for example a range of pinks for dawn)? Semi-random here means chosen at programming time, not different each show!  I wish to avoid an absolutely uniform colour because the discrepancies between fixtures and the imperfections in the whiteness of the set simply show up.  I can obviously do this manually by slightly varying the hue on each cell but seems 

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