Like most novels, Their Eyes Were Watching God contains numerous metaphors. I do not have a list of all the metaphors in this work, though there are plenty to be found. The language throughout Hurston's work is full of figurative and metaphorical imagery. The last paragraph of chapter 4 is a great example. It says:
So Janie waited a bloom time, a green time and an orange time.
She knew the world was a stallion rolling in the blue pasture of ether. She knew that God tore down the old world every evening and built a new one by sun-up.
The novel is filled with such language, and the metaphors are too numerous to list. The pear tree in the beginning of the novel is clearly a metaphor, as are, probably, the rabid dog, the hurricane, and the marriages.
The metaphor (technically the simile) which is most applicable to the theme of the novel. however, regards Janie's view of her life. The first line of chapter 2 is a metaphor for how Janie sees her life:
Janie saw her life like a great tree in leaf with the things suffered, things enjoyed, things done and undone.
Just do some reading, and you'll find metaphors of this kind everywhere you look.