Vivian Vande Velde writes funny and spooky stories and novels for children and teens.  Some of her best collections include 
Being Dead: Seven stories that are all wonderful and range from gently creepy to out-and-out horror. One story  made me gasp aloud. The stories are definitely dark, but very  good.  
All Hallow's Eve, wonderfully weird Halloween  short stories by the mistress of horror and humor for young adults. Some of the  stories are genuinely chilling, some are lighter and funny, but all are  delightful.  Two of her best YA novels include 
Heir Apparent, where a girl gets trapped in  a virtual reality game and has to replay the game until she can win and escape, and 
Now You See It.  Wendy finds a pair of sunglasses on her front lawn and finds  that she can see things beyond the normal world, including a doorway to another  world, where she meets a variety of interesting characters including one of her  own ancestors.  See also 
The Rumpelstiltskin Problem and 
Tales from the Brothers Grimm and  the Sisters Weird under Fairy Tales Retold.