I don't have a specific gift in mind, but I had a great-great-aunt who was up in her 80's and would do all her Christmas shopping at the Family Dollar, and all her gifts were tacky and age-innapropriate. I think when I was 14 I got some play jewelry and plastic make-believe makeup. We do Christmas wish lists with our family, so it's always a running joke that you better hurry up and send your wish list or you're getting Aunt Ruth gifts in your stocking.
Every year, my mom's step-mother-in-law gets her bath salts. She doesn't have a bathtub in her house, only shower stalls.