leather
China (as in porcelain) is the traditional gift for the twentieth anniversary.
Wood is traditionally the 5th Wedding Anniversary, but in the modern symbols it is the 6th anniversary that is wood.
silver plate
The third wedding anniversary is traditionally associated with the gift of leather. It symbolizes durability and strength in a relationship. Modern interpretations also suggest that a crystal or glass gift can be given to represent the clarity and beauty of the couple's bond.
The 25th anniversary is traditionally the silver anniversary, so a silver watch would be a great gift for that occasion.
something made from silver usually
As far as wedding aniverseries go, they end at the 60th year known as The Diamond Wedding Anniversary.
Traditionally, paper is given for the first anniversary. So a book is a good first anniversary gift, or maybe some origami paper. But technically, you could get away with just a card. :P
furniture
Traditionally, the gift for 15 years is crystal, but watches are the modern version.
paper
furniture