Guitar Aficionado columnist has written a new blog aimed at bolstering studio creativity. He suggests placing limitations on yourself, such as soloing on only two strings, cracking down on number of takes, and consciously eliminating vibrato, bends, and slides. From GA:
Learn what a single-pure note sounds like. Listen and see what can be accomplished by doing this. You will learn to limit the over-use of decorating the note with unneeded movement. The next time you go for a solo, you may hesitate before doing the bend and try to wait a bit longer before applying the vibrato.
Read it all at Guitar Aficionado.