Maybe you can suggest to your friend making a quilt about The Beatles without The Beatles fabric. I mean, you could use music themed fabric (with musical notes, pentagram, instruments, discs, etc...) and fabric with peace symbols or other things related. Then, add a big applique with the letters of the name of the group in the center or any visible part of the quilt.
You can even embroider the titles of her favorite songs in some blocks...
I think it would be a lovely quilt.