Why not offer posters at the merch booth (or something more ticket-sized, I guess)? I always look forward to show posters. It helps foster a sense of community too, when you work with printers and a cadre of artists.
I think Derek Sivers [0] had something to say about this. He used to run CD-Baby, and IIRC was also a musician with some well known bands from back in the day. I've found his stuff about different ways of approaching live music very thoughtful
Not sure how it will go, but an interesting experiment I think.