Yes, you can design and illustrate it as you desire.
Flowers, birds, synagogue anything.
Look up for some ideas on some web site for old ketubot.
ketubah = כתובה
A ketubah is a marriage contract. The ketubah is like a marriage license from the state, but it is made up for Jewish couples. It has elements of a prenup in it, and the rights and obligations of the man AND the wife.
Ketubot
Neither a relative of the groom nor bride can sign the ketubah - it has to be a Shabbat-observing non-related male.
No, the ketubah is signed in a private ceremony before the public ceremony. It is read out loud during the public ceremony though.
Call your rabbi and ask about how to get a replacement.
Ketubah
A ketubah is a sort of Jewish marriage contract, designed to protect the wife financially in the event of a divorce or her husband's passing. Custom ketubahs are available at a variety of places.
Ask the rabbi what to do.
It's the Jewish marriage contract.
As I can see no reason to think either Susan Fontanarossa or Domenico Columbo were Jewish, so they would not have had to sign a Jewish prenuptial agreement (Ketubah)
There is the Ketubah which is signed by the husband and the wife at the wedding. The Ketubah is basically a Jewish declaration that you are husband and wife, and that you promise to be faithful, kind, etc., to each other. It is not a legal document. But if you are religious, under Jewish Law, they take it very seriously. There is actually a form of a court that is make up of rabbi to settle issues in the community, but I digress....