Excellent offer, I hope you have fun creating and blogging about the process.
I would like to suggest creating a logo for the Gramps project  (a Genealogy Program) which I just found a few days ago and in a reply to me one the developers mentioned that they have "No real official logo." and from the looks of the project they could use a new wiki template.
Please consider upvoting to help improve the project.
 - http://gramps-project.org/
 - http://goo.gl/JDN1
 - http://www.gramps-project.org/wiki