The British manufacturer 'Narked at 90' (who incidentally distribute Shearwater in the UK) have launched a custom coloured bezel. Although you can already personalise the start up 'splash screen' with your name or an image, it is still quite possible to pick up someone else's computer when you are distracted, hence this looks as though it could be a handy "this is mine" identifier.
A more protected Petrel
At present the Polycarbonate screen is quite robust and can take a knock. However some divers have been known to torque down the screws that hold the screen in place and this can compress the screen. The screen can then crack or micro cracks can develop around the screw holes. The polycarbonate screen is also predisposed to chemical damage. Narked at 90 states that the method of fitting the Titanium screen does not rely on the screw holes, therefore the screen cannot be squashed, giving it better longevity.