I know, it’s what’s inside that counts. But for some reason I love aluminium cases. They look and feel so perfect, cool and beautiful. All of my 5 main devices have nice silvery aluminium bodies by now:

My laptop (Lenovo IdeaPad U430p), netbook (ASUS Chromebook Flip C100P), smartphone (HTC One M9), tablet (iPad Air 2) and portable backup drive (Integral Fusion USB 3.0 Flash Drive).

Update 9 April 2016: I added one more device, the Chromebook. That makes it more fittingly 5 (and not 4) “shades of (silver-)grey”.