I've been following Stephanie's wedding plans over on her blog, and thought I'd share this. My guest book at my wedding was just some fabric squares for everyone to sign. I pre-cut & ironed to freezer paper to make sure it was easy to write on. My bridesmaids had to bully some people into it, but I got a square from almost everyone. I then used the colors from the wedding (blue and white) to make this quilt.
It's king size, so it's huge. It was on our bed for a while, but the cat was starting to destroy it, so I had to move it. Here's a detail of the signed squares.
This was so much fun to read through, and fun to make as well. I hope this gives some ideas to others.