The Modes may be a place to create melodies, but just because u can fly up and down a "box" pattern, doesn't mean u have anything meaningful.
If u really come to a loss, play back ur chords some time, and don't even have ur guitar with u. Try to hum or sing melodies, fast or slow, that sound good over them. Because wen it comes down to it, following a scale isn't important.
Notes and melodies that sound good to ur ears r important. Next, try to transfer those notes u sang onto guitar. Then u will really c ur music come alive, because it will be music u hav created.
Another trick is to listen to the pros, then derive licks that r a little different from them. I'm not a big fan of this, since it is a way of just copying licks. But of cours, most people c copying as a form of flattering. Go figure.
Try to experiment with different, sounds, tones and chord tones.
Another trick is to use different exotic scales. I think The Falcon has a site that teaches this.
Also try using classical masters music in your playing, like Yngwie Malmsteem, or guitartricks' own Azrael.
It comes down to wat sounds good to you.
-hope this helps man, rock on!
------------------------
Randy lives in me
There are only two important things in life - There's music and theres girls, not necessarily in that order....
The Ace's Guitar Tricks
The Ace's Guitar Tricks