If what you're saying is that the verses have to rhyme with one another instead of the lines within a verse rhyming, there may be a misunderstanding. I think 'rules' exist to help those who need them, much like the lines in a coloring book. If you know how to draw, you don't need the lines. I think you need to learn the rules though, in order to consciously decide you don't want to follow them. You just about have to break the rules, or your songs will be formulaic, 'cookie-cutter' songs.