From David Starkey’s excellent Creative Writing,
Read published poems . . . and respond to them with poems of your own. It doesn’t matter whether you respond to the subject of the other person’s poem or just a single line or image. Generally it’s most effective to find the moment of maximum energy or tension in the published poem. Identify what excites you about the poem, then make the same thing happen in your own work.
Try this using either a favorite poem or one of the “2250 Five poems” at MetaphorByMetaphor.com.