What are some of the best (most entertaining)Spanish language fairy tales and other fiction for up to 8 years?

I am looking for stuff that would be good for very young kids with small vocabulary. Kids up to 8 years old. But it would be for an adult who is just now learning Spanish, so it should have some entertainment value to it. It can even be scary, dark, or sick. In fact, I would prefer that, but limited vocabulary is the issue.