There are several commercial sites on the web that provide you with free guestbooks. If you are publishing on gladstone, you can use a service provided by the Academic Web Publishing Service, an automatic guestbook creator. Add a link to your new guestbook from somewhere within your paper. Intellectual honesty demands that you not modify any of the comments you receive, but it's legitimate to delete comments that are really irrelevant or inappropriate. Don't just include graphics and color without a good reason, but do think about ways you can use them to communicate effectively.
Graphics can make a page load very slowly, so be cautious from that perspective too.
A web page that takes more than a minute to load is probably one that most readers will be unwilling to wait for. The copyright probably belongs to the university, but in practice the permission of the author was all that was obtained. The thumbnail links to an image developed by the InfoGraphics Lab in the Geography Department, whose web site implies that permission is given to members of the UO community to use and modify it. I think we're safe. Make sure that you don't violate copyright law in acquiring and using images.