I went out to Von Maur to see blueberry IRL - it is a brighter blue than cobalt, believe it or not. I saw the blueberry Conrad and my first thought was WOW! Not a good 'wow' either. I went prepared to spend $450 (because I love the Conrad bag) and I came home empty-handed, what does that tell you?
Cobalt is a wonderful deep blue. Blueberry seems to be the comic-book version.
The linings are varied - the F/W 08 Conrad linings, for example, are silky. The Spring 09 lining (the fig, for one) seems heavier duty, but still has a silky feel, just not as 'flimsy' feeling.
These two photos, compliments of Blue fly (Inka) and Hayden-Harnett (Conrad) are true to color. I have the Inka, and I saw the Conrad.