Almost heresy. And you know by now that I sincerely love Giuliani. You've seen the 120 Studies for the Right Hand. They are awesome and necessary pedagogical technique studies. But, BUT! Flipping from C major to G7 to C major for the amount of time it takes to run through the entire 120 Studies will leave you with a sonic hangover.
Larry Silvestro, noted double bassist, guitarist and teacher suggested using other chords, i.e., run the thing with E major and B7 for a while, swap out to A major, try some minor keys, you get the idea. What I did eventually was make up my own series of exercises utilizing all the right hand patterns that Giuliani suggested and then string them together to form a continuous 'piece'. If you own the 120, go through them trying this kind of trick. If you don't won the 120, consider getting them -- soon. With those ands the Carulli Right Hand Studies, you've got the issue covered!
Check out this brief excerpt of what I did to Giuliani.