A few years ago, I created a display of the suggestions students had submitted and the responses from the library. This seems to have had a very positive impact. There are far fewer suggestions now because many of them have already been answered. In addition, my boss believes (as do I) that our responsiveness to the suggestions has increased students satisfaction with the library. We are unable to carry out many of the suggestions, but we always respond and tell them why.
Recently, my boss gave me another suggestion for soliciting student feedback: a poster board with a starter phrase and space for students to respond. Over finals I thought it would be nice to get them used to the idea of being able to write in this space by putting up two posters more for stress relief than feedback. We had "Finals are..." and "All I want for [favorite winter holiday] is...." As you can see below, we definitely got some responses.
I just finished putting up two new posters - "I love my library because..." and "I wish my library would...." I'm looking forward to seeing what the students write. Classes start tomorrow, so they'll be back soon!