I had 2 daughters get married this past summer & both wanted a quilt guest book.
One chose a piece of fabric for guests to sign - I put freezer paper on the back and arranged it like a tablecloth on gift table with fabric markers - this will be the back of her wall hanging. We plan to create a 'memories' front using photo transfers, ribbon, tulle, pieces from gown & attendants dresses, etc. (may be done by her 5th anniv. LOL)
The other one asked for a signature duvet. I premade 6" rail fence blocks & again ironed on freezer paper to stabilize while writing. 1/4" lines were drawn as a reminder to stay in the lines. These were put in a basket with markers for guests to sign. Blocks were given to relatives who couldn't attend the wedding. These will be sewn together to create the duvet cover top.
On both occasions someone was designated to mingle & remind guests to sign.