The largest trend over the past few years has been shying away from the traditional wedding guest book and is aimed at being a much more interactive experience for your guests and that will enable you to come up with something a bit more personal.
We have covered many funky trends in this field previously but if you want to achieve something relatively simple then all you will need is an instant film camera. Simply set up a little station where your guests can take pictures of themselves and fit them into the book you have put out for them to display the shots in which they will them be able to annotate..
Our tip is to go for a Fujifilm Instant camera as these produce some of the best automatic quality shots around. After all you will want a simple camera that gets good results as your guests will have a huge range of varying photographic skills - from lots to minimal. So best thing to do is to keep it as simple as possible.