I have loved nearly every passacaglia I have ever heard. Maybe even all of them. I'm not sure what it is about them.... Give me Britten's Peter Grimes. Give me "Dido's Lament" from Purcell's Dido and Aenaes (another all time favorite). Give them all to me. They're wonderful.
So today, without really expecting to improvise a passacaglia,
here we go, Day 25: https://ia600702.us.archive.org/14/items/Improv9811/9_8_114_44Pm.mp3