AeroCool's DeadSilent (DS) series of computer cases started out in black, but it's branching out now, offering two new color options: white and red.
The enclosures aren't really cubical, since it's not exactly a shape that PC hardware would fit inside very well, not without being cramped or wasting space.
Still, they do come really close, measuring 411 x 265 x 381 mm / 16.18 x 10.43 x 15 inches.
They have room enough for a 5.25-inch drive bay, three 3.5-inch bays, a standard ATX PSU (bottom-mounted) and a micro-ATX motherboard tray, set horizontally.
A 200 mm front intake fan is present as well, plus a 120 mm exhaust fan.
As for I/O, the front panel has the expected audio jacks and USB ports (two USB 3.0, microphone and line-out audio for speakers/headphones).