I actually use dried orange slices to deter my cat from the tree. Im going to have to tey these this year :-) How to Make Dried Orange and Cloves Slices Christmas Decorations - Our Little House in the Country
Dried Oranges / To make, cut shallow slits in the orange/lime peel from top to bottom without removing peel. Make eight to 10 slits on each orange. Allow slit oranges to dry in dehydrator or low-heat oven for 12 to 24 hours.
Dried Orange Slices Christmas Wreath - This is a great post, showing how to decorate your home for Christmas, using citrus fruits. There are some great pictures using them & basic info on drying fruit to use in decorating.