I love to see a thin, light bright colors for the 925 kind of like the charger cover but a little bit thinner. Plastic would be okay but something more expensive would be idea - aluminum!
What t-mobile is offering now is dreadful. I bought a case and screen protector, the case is ill fitting and makes the phone feel awkward in my hand, the screen film is not remotely cut for this phone although it is being sold for the 925, it doesn't meet the edges and is completely the wrong type of cutout at the top. Just terrible! The case is not the standard Nokia issue, not a wireless.