I actually like these Apple minitowers:
These were the cases for PowerMacs 9600 (200, 250, 300, 350, dual and single CPU versions) and the later PowerMac G3 "beige".
They had also a "horizontal" desktop version:
But for me, the minitower was the one, that had that type of "power" comming out of them. You could feel the therm "power" in/out of these boxes. The later G4 towers were a joke, not in functional term, but as a design, especially because of these curved lines and colors (aka PowerMac G3 blue & white). However, I liked the PowerMac G4 Digital Audio too... oh, well.
My first Mac was a clone, Umax Aegis, but I also like the case of its biggest brother, the Pulsar series: