I think i made up a new technique! Play the bass normally (with fingers) then turn your hand 90 degrees to the right (away from the pickups [so your hands are parallel with the strings and your fingers are moving towards the bridge] ) and play, but use your finger nails. it creates a scratchy sound, but the notes are still auditable! (sp?) I dunno if this can be classed as a new technique, but i think it sounds cool. even better with a moderate amount of chorus effect on it.