These are two of my favourite and also two very popular minor progressions:
Minor progression 1: (Sensitive female chord progression)
i bVII bVI III
(In the key of Em this translates as Em D C G)
Minor progression 2: (Andalusian cadence)
i bVII bVI V
(In the key of Em this translates as Em D C B)
The V in Andalusian cadence is anon diatonic chord, best way to think of that as a modal interchange, a borrowed chord from E harmonic minor.