I remember being a kid when standardized port colors came 'round (what was that, part of the AC'97 spec or something?). I thought that was dumb: I knew that the speakers plugged into the third hole from the top, and that was good enough for me. ;)
Back then: I would have loved black-on-black, labelled-in-black, with black cables and and black highlights on a black background. The accessories would be black, too: Black keyboard, black featureless keycaps, black mouse, with a black mousepad, on a black desk, in a black room with black walls and black windows.
Black.
I couldn't get black back then, of course. Computers were beige. The necessary floppy and optical drives were beige. Cables were beige. Keyboards were beige. Motherboards were some moral equivalent to beige. It might be possible to get one or two components in black at some points, but the rest were going to be beige so therefore the whole thing might as well just be resolutely beige.
That really annoyed me.
But I'm not a kid anymore; I'm old. I just want stuff that works well, and that is expandable enough to do some fun and unusual computing stuff with, and that I can see so that when I'm futzing around with it then my job is easier than it would otherwise be.
I don't want RGB or a tempered glass aquarium that shatters when part of it touches a tile floor the wrong way. I don't care about having multiple choices for the color of the anodizing on the heatsinks for the RAM. I don't want water cooling when a big slow-moving fan and some heat pipes does the job very quietly, with improved simplicity therefore longevity. I'm not trying to win a cooling benchmark; I'm just trying to keep the CPU within its specified thermal range while it does work for long periods at its maximum speed. I don't care what color the fans are as long as I can't hear them.
If I want to play with RGB by making or buying some party lights, then I know how to do that. Party lights for the room (or the whole house!), not the guts of the PC. :)
Otherwise: The computer is on the floor under the desk and the USB hub is on top of the desk, and that's all I need to deal with. It is purposeful and functional. There's no style points here, but I just don't care about that anymore.
(I'll be outside yelling at clouds if anyone needs me for anything.)