Guests may also sign as a commitment to support the couple in their marriage. Originally a Quaker tradition, marriage certificates can be an alternative to the traditional guest book. A nice advantage is that the art piece can be framed and hung in the couple's home as a special remembrance of the day.
Calligraphy by Riva Brown of Wilmington, Delaware.
And totally unrelated to this post, but too wonderful not to share... Kelli Anderson's The Human Body is a new video that aims to teach children about bodily functions. She cut all of the parts from paper; even the sound effects are paper!
Another nifty project Kelli did a couple of years ago for friends of hers is a wedding invitation record player!