Emily mentioned this year's holiday stamps from the USPS are knitted. If one really wants to get into knitted holiday stamps, why not photograph one's own holiday knitting, and have them done into a custom stamp with personal meaning? They could be Christmas, Hanukkah or Kwanza themed - whatever. My sister made some up for us a few years back with Dadiva, my dog who just died yesterday. Now they have particular sentimental attachment for us.....There are a number of websites that are authorized by the USPS for making the custom stamps - use whichever search engine you like to find them. My personal favorite is Vivisimo clustering search engine - the clustering helps me quickly hone down my search in the right direction.