I agree with the grass green since it would add a nice pop of color to your collection and would be different than the blue you already have. I think marine and blueberry are too close to the french blue.
I really like it actually. It's pretty big inside (I have the medium size hook). But I'm one of those people who don't zip their bags...and the hook as I'm sure you know has that lock closure...well, it hangs if you don't zip your bag and it hits the hardware.
It makes a lot of noise...you can hear my bag clicking and clanking from space. Other than that it's pretty nice...lol