Hall and wall are easy rhymes and some of the link between them comes to mind:
Dark coats ...................... academic gown
Great men in their time, all male all vanished
Leaving these oil imprints on the wall
To grace and entertain our bacon eggs and mushrooms
What after great coats? Medals? What are those things over their shoulders? Sashes. Oil imprints? What about oily imprints? Makes it sound slightly dirty as if leaving a muddy footprint. I quite like that idea.