I never particularly liked my burgundy coloured EU member passport, which was forced upon us by Brussels, so I kept mine looking as it always was, and will be once again. People seem to be making a big fuss about its return to dark blue.
Of course mine (and Lady Magnon's) are only for decorative purposes, and inside lies the official EU red job.
Mine hasn't had a lot of use, but it's been often abused. In Germany I had the interior passport 'ripped' out in a very aggressive manner, and the leather cover cast to one side. The Germans really do like to think they are in charge of Europe these days; I can hardly describe how we were treated as 'non-Schengen members'. But at least my UK passport ensures that I can still travel to the USA (not that I wish to), unlike those Schengen members.
I expect my passport will be getting more use in the years to come. In future when entering mainland Europe we'll be strip-searched, shackled, waterboarded, and beaten with sticks.
But at least my passport will be dark blue.