I know that Audrey always wore white eyeshadow with liquid black eyeliner.
I'm doing the same thing, but I'm updating it a little bit. I either use a colored eyeshadow (either lavender or pink) or a taupe or beige eyeshadow with a black eyeliner pencil. (I'm not coordinated enough to use black liquid eyeliner.) Instead of a really thick line like she wore with her eyeliner, I use a thin line to a medium line.
I don't normally wear eyeliner, but when I do, I always think of Audrey Hepburn, and how she made it look classy, and not gothy or vampy.