My suggestion would be for you to record the last couple chords of Verse 1, all the transition chords from Verse 1 to Verse 2, and a few opening chords to Verse 2. You've just isolated that section of your song... now, just play this a few times and try to hum a little melody during those transition chords. That's kind of the method I use, but instead of humming, I just listen to the chords and I can hear it in my head. Now, once you hear this melody in your head, QUICKY RECORD THE IDEA. I get so pissed at myself when I come up with an awesome riff or melody (NOT listening to the radio while driving is quite inspiring), but forget to record it when I get home and then I can't remember what it was. Once you've got the idea on tape, get your guitar, listen to the tape, and work it out on guitar. You'd be surprised at how hard it can sometimes be to learn how to play something that YOU came up with in your head :) Anyway, this is not exactly the most concrete method, because it may take a week for you to think of something good, but on the other hand, you might have something on your first listen.