Get a unique piece of art from your child's photo to serve as your sign-in. This portrait from Liz Oliner, the same artist who created a portrait of MitzvahChic author Gail Greenberg's daughter can also go on invitations, and a zillion items in your own store on Cafe Press. 

See an example at  http://www.cafepress.com/olinergraphics/3662538  .  And visit Liz's website at the link below to see Ms. Greenberg's "before" and "after" picture - and a great "before and after" of a bat mitzvah mom (who is not Ms. Greenberg's mom)! But mom portraits - there's another great idea!