In Austria grounds used to be yellow with several thin green stripes, nowadays cheap wires is often 50:50. One hals´f green, one yellow. Especially nice withold systems where both yellow and green have been used as a ground wire. Personally I prefer dark colors. For example in our remodel we had white and light grey, and they were sometimes almost impossible to distinguish. Dark grey is much better here. Plus the dark colors look much nicer. Just think of the old grounds! I have some that are a wonderful deep bordeaux!
