(I decided to start doing these again this session and see if they are of benefit to others and myself. I take bits and pieces from conversations in classes, combined with nuggets of language - removing any identifying factors and changing necessary details to preserve anonymity - from classes. I used to do this more and it's a lovely way for me to gather all I got out of the classes, and have a place for everyone to see the collective wisdom and struggle I get to see each week.)
"Where I Am" is my favorite default prompt nowadays, borrowed from Natalie Goldberg via Saundra Goldman and her #continuouspractice group on Facebook. "Where I am" is a classically good prompt - it can be answered very directly, with description of your physical location, or it can be taken many different possible directions - where you are in your life, where your mind is right now, etc. It seems boring, simple - but it is multidimensional.