Tin (or aluminum) is the traditional gift for a tenth year anniversary. Although, we weren't celebrating a wedding anniversary, I gave my longtime boyfriend (now fiance) a tintype portrait to celebrate our tenth year together. And, the following pair I bought for myself.
Erin and Nicole from Bird and Banner shared their anniversary ideas a couple of weeks ago on Design*Sponge. I'm a big fan of their work and especially like these ideas:
two years: cotton
four years: fruit / floral
five years: wood