Wilde's fairytales are hauntingly beautiful, of course (The Star Boy, why, just whyyy... that ending was one of my biggest literary heartbreaks!).
We read The Happy Prince in junior high or high school, and the only part that stayed with me was the swallow in winter element. At the time I was "well, that was pointless." I read it again a few years ago, after 30 years life experience, and wow, that was a good story.