I have found it fun and helpful to play with rhyme when I am suffering from writer's block. It's like the block occurs because there are too many words from which to choose, creating a blockage in the conscious channel of the mind. By limiting the words to ones that rhyme, the blockage is loosened and flow can be reinstated. Later, it may be desirable to go back and edit out the rhyme if it sounds too cliche, but the rhyme has served a purpose either way. Rhyming seems to allow the mind to drift to a more lyrical, unconscious level where Pete picks a peck of pickled peppers (obviously not a rhyme, but an example of how a little silliness can loosen the death grip our hyper conscious censors wield over our creative efforts.
