The say that Singers came in all colors, but they were all black. It was true for a long time, many of the guildings and decals were colorfull; roses, flowers, colorfull swirly patterns like the Tiffany version.
I think the first signs of other colors came in the 50s, beige, two tones, green, and there are some industrial paints with a some sort of shimmering or marble like effect, greyish blue or greenish blue.
I don't mind the ochre yellow too much though, someone wanted a lighter color, it's less demanding when it comes to lighting. I prefer the origial black jappaning when possible, but on some machines there's hardly any left. It looks a bit dirty, it needs a clean ;- )