I recently went for a hike in a local park with some friends and we came across these strange looking balls that were sprinkled all over one part of the trail. One of my friends knew what they were (Osage oranges) so we collected a bunch to use as decoration in our house. They smell great (kind of like an orange peel) so I made a stack of about six of them in a glass bowl. The texture looks beautiful on our dining room table and they really make the house smell amazing. Also very festive for the holidays!
Here is a picture of the tree they grow on. Maybe there is one near you too!