Most of the really great scale runs and arpeggio sequences are acheived by the addition or omission of a note or two,in the scale or arpeggio.I remember George Lynch's wide-intervallic trick from "Street Fightin' Man",among many other examples.Trial and error and thinking outside the box are the exotic trick/scale seeker's best friends.Adding the seventh (G) to a plain Am Arpeggio can dress it up,if executed properly.As can simply adding a B,and going A B C E from A(5th fret-low E string) all the way to high E (24th fret high E string) and back.As most of you probably know,string skips and skipping notes in a scale itself,is one of the hardest but most rewarding techniques there is.