You could get a yummy ice cream cake and top it with old fashioned wooden Little People figures, or get a nice picture of the two of you and place it in a nice wooden frame. Also a wooden jewelry box would be a great gift too.
I hope those ideas help.
Traditional Anniversary Gifts by Year
Second: Cotton Third: Leather Fourth: Fruit or Flowers Fifth: Wood Sixth: Candy or Iron Seventh: Wool or Copper Eight Bronze or Pottery Ninth: Pottery Tenth: Tin