Beauty is definitely in the eye of the beholder. For the record, my 2 least favorite colors for bikes/autos/etc. are black and white. Nothing says "fleet vehicle" like white paint. I like them as contrasting colors, but not the main color. I also don't care for flat or matte finishes. Give me some shine and give me some color. Anything that looks like primer is yuck. Dark blue or dark purple looks so much better than black. Same for pale/light colors and white. The light greenish color on the Engin above looks way better than if it was white. Just my opinion.
Also give me components(stems/seatposts/etc.) that are either shiny silver/chrome or black. I don't need to see those items in colors that are matching the frame color or some exotic color. I just don't. Bar tape and cable housing, whatever works for you. Go for it. Glad I got that off my chest.
There is an old Nissan 300/350ZX in my area with the following paint job:
Murdered out black on one side and green/desert camo on the other. Split right down the middle. Yuck.