I don't think there was a 'traditional' material for the 29th anniversary (they were savd for the round numbers - 30th, for example is pearl). I'm tempted to suggest that anyone married for that long deserves a medal ;-)
There are 'modern' lists floating around cyberspace but they seem to be composed by people with something to sell. If you trust the Chicago Public Library System, it's "modern furniture"... but then I hope you remembered to give orchids last year! (See
http://www.chipublib.org/008subject/005genref/gisw
edding.html
).