If you're already using an All Around Square Up, you should look into the Midnight Shift. For the longest time, if I wanted to use a Pass for a Color Change, that's the one I'd go too. You may want to also consider the Invisible Pass from Expert Card Technique. It's essentially a Herrmann with a wrist turn to cover the move. I usually use it when I have the option to pull up my sleeves, since it flows well out of the wrist turn. I've also used it to rub the pack on my leg or something else nearby. Really, there are a lot of ways to cover the move.
That Invisible Turnover pass is quite nice. I've had that book for six years an managed to gloss over that move every time. Sometime the coolest stuff is in your closet you just forgot it was there. Thanks X! Where can I find the Midnight shift?...It's probably in a book I have lying around here someplace