When it comes to song lyrics, I usually jam on the music while I try out some ideas for the phrasing and melody of the vocals. Once something starts to fit musically, words and phrases start to pop into place. I usually do this untill I've got about 50:50 actual lyrics to filler then I sit down and finish writing/revising them.
That's probably not terribly useful, but it works for me.
That's probably not terribly useful, but it works for me.