Old tag collection

     Each year, we get new tags for Annie and Paul from the city (registration tags).  Every 3 years we get new rabies tags.  And for some reason, I can't bring myself to throw them out or toss them in the recycling bin.  So here they sit.  I've added them to the Christmas tree once or twice when we've lacked ornaments, but I'm not sure what else to do with them after that.  Any suggestions?  Sadly, this is as clean as I can get them.