Metaphors in and out Buddhism
This city (body) is built of bones, plastered with flesh and blood;
  within are decay and death, pride and jealousy. - [Dhp. 150] 


The Dhammapada is full of metaphors, similes and comparisons. It is a collection of sayings of the Buddha in verse form and one of the most widely read and best known Buddhist scriptures. Here's a good article on that.