Gift for a Sigma Chi Chapter?

[unglamorous]

At my university, violence against women is an issue, and I'm very actively involved in the prevention effort. I'm in charge of a program we're launching in October in which several organizations across campus will be "adopting" a member of my organization in an effort to build relationships. Another young woman and I will be "adopted" by the Sigma Chi chapter here. They've always been incredibly responsive to the issue of violence against women, and we enjoy working with them very much. To commemorate our adoption period, we would really like to present the chapter with a gift because of their willingness to prevent violence against women. Could anyone suggest something that might be appropriate?