Could you expand a bit on that. I have come across examples generating poems from Shakespeare works and realistic looking css/javascript but still trying to find out a more realistic usecase.
Even very simple transformations, e.g., adding alliteration/assonance or adding rhymes everywhere, might be fun.
Should help you break down sentences into their semantic parts. The transformations are then made by walking the syntax tree and modifying the tagged parts of speech as you see fit.