Nice one John. Do you think that will help your WAF?
I thought about pictures of musical heros, favorite artists, etc. They can adorn the walls like a shrine, and do some good acoustically too.
Beethoven
Movie Poster from 1934 Russian film "Lt. Kije" music composed by Prokofiev
Clifford Brown
Probably these wouldn't be a standard series material.... But you could do genres, like classical Beethoven Brahms, Bach, Shubert, Haydn, etc. Then Blues guitarists, Jazzers, hard rock lead singers, etc. Mayber a half dozen in each category would allow people to pick their favorite three. Finding non-copyrighted pictures of modern stars could be difficult. But even if you pay for them it might still be worthwhile.