Attendance Cards
I have taken Lynda Barry's Writing the Unthinkable class twice. One of her exercises is the daily attendance card. The assignment is to Draw Yourself As (fill in the blank) on a 3 x 5 index card for the duration of one song. In an online community, several of her students (including me) took turns providing writing prompts with an accompanying song for one week. We passed the torch around like this for several months. Here are most of the results.
Roll over image for the prompt.

at any time before your inception