First off I have to say that I work in the medical field so it cracks me up to be on this forum and keep reading about BM's - lmao.
Anyway, I LOVE these personalized hangers - I ordered one for myself from lilafrancis on Etsy (she has a bit of a waitlist but I LOVE her technique and hers are $15 (you then add to your own hanger or $20 complete). For you bridesmaids that arent married you could always do their first name and then a design such as a heart, flower or related theme to your wedding (palm tree, starfish maybe) or you could simple do bridesmaid, friend, name of where ever you are going (ie Jamaica). Just some thoughts.
Another idea might be to watch for thirtyone sales or something similar and get them a flatiron "case" with their initials or a make-up bag, jewelry roll - something to assist in their travels for this and future.
Best of Luck!