It goes like this :
He uses the most wacked out idea he can think of to make a solo and envisions his guitar not only as a guitar but how to make it sound like a scratcher for instance
(He turns the middle pickup off and scratches the strings with his pick in his right hand while moving the pickup selector up and down with his left)
He also uses things like ball point pens and bricks and nails and screws etc
So,,,,,
Break out your tool box crank the old amp and give it some juice with a nail or bolt ...... and see what happens,
For some thoughts on originality see my spiel on SRV