This poem by Robert Herrick alternates iambic tetrameters and dimeters:

                           Lord, Thou hast given me a cell
                                Wherein to dwell,
                            A little house, whose humble roof
                                Is weather-proof:
                            Under the spars of which I lie
                                Both soft, and dry;
                            Where Thou my chamber for to ward
                                Hast set a guard
                            Of harmless thoughts, to watch and keep
                                Me, while I sleep

Christina Rossetti, in "De Profundis" ends her tetrameter stanzas with a dimeter:

                                Oh why is heaven built so far,
                                     Oh why is earth set so remote?
                                 I cannot reach the nearest star
                                     That hangs afloat.

And Ebenezer Elliott, in "Battle Song," uses this meter:

                    In vain your pomp, ye evil powers,
                         Insults the land;
                    Wrongs, vengeance, and the Cause are ours,
                         And God's right hand!
                    Madmen! they trample into snakes
                          The wormy clod!
                    Like fire, beneath their feet awakes
                         The sword of God!