Black Is Best
There is no cleaner and more compatible technological device aesthetic than all black everything.
Though I don't have an OLED device, you'd think I do if you saw my set-ups.
My phone uses a minimalist launcher with white text for apps on a black background. My keyboard is themed black and white, and any other apps with 'black' instead of just dark mode are set to it.
On top of that, I primarily set my phone in 'Reader' mode, which buts a grayscale filter on everything.
I love it.
My laptop is much the same. Black wallpaper and black theming wherever I can.
On a computer, the effect is a wonderful simplicity, where it is impossible to tell where the window ends and the background begins.
It's not always super functional, but damn does it look neat.