I am currently interested in writing a piece in natural minor, and it seems like "v - i" cadence does not quite work as well as compared to harmonic and melodic minors, which use "V - i". How can I write a good cadence in natural minor? Would "VII - i" work well?
Your best bets will be v(7)-i, VII-i, and iv-i. For a piece that uses all of these, including both perfect and imperfect cadences, listen to (I'm remembering back to old choir days): "I Know That My Redeemer Liveth" by Joseph M. Martin.