I'm only concerned with providing a nice blue compliment to the colours of the lens section of the phone. Since the rest will be covered by the case anyway, I don't care if those colours clash.
The lens area of the blue titanium PM is pretty dark, so I think it's likely to match a nice earthy blue case. The cobalt blue from Bellroy would look awful with the pro blue, imo.
View attachment 2266927
It pops too much and needs a phone colour that pops as well.
Up until a few minutes ago, I was drawn to the Caudabe Sheath, but recent reports from people who ordered one say the celestial blue colour is much darker irl, and comes across as more navy.
View attachment 2266928
That's a little too close to the colour of the lens section, I think. It looks great, but I'm not sure.
Then, consider monaco blue from Mujjo.
View attachment 2266929
That one looks like it could be the perfect middle-ground. It's got a bit of pop, so it's more distinctive than the Caudabe, but it's classier than the Bellroy, which just doesn't work with the pro blue, imo.