The advice about approaching a solo as if you were singing it is good.
Try playing the exact melody the voice would sing over the part you are soloing over. Then add little variations and spice it up a bit. Often bending or sliding into some of the melody notes is all it takes to make it cool.
Try to hear it in your head first, then recreate it on the fretboard.
-Rick
Play what you hear
Listen to what you play
Does it sound good?
Listen to what you play
Does it sound good?