I remember flicking through a young-adult horror novel, years and years ago, but I can't remember who wrote it, or what the title was. The book was like one of those R. L. Stine "Fear Street" books (Not Goosebumps), or like the kind by Christopher Pike.
From what I remember a teenage girl starts having bizarre nightmares about people being murdered in strange and gruesome ways, only to find that her high school classmates are being found dead exactly the way she dreamed they would die. The first nightmare I remember involved a teen boy being murdered by a hooded cult, stripped naked, a yellow stripe painted down his back and flowers stuffed deep down his throat choking him with pollen. the next day she found out one of her neighbors and classmates was found dead in his room, exactly like she dreamed about, naked, yellow stripe, throat filled with flowers and pollen.
Does anyone know what book this was? It's been bugging me for years!