Pictures! Pictures!
It is true that one size definitely does not fit all. I personally would be uncomfortable showing off toes in colored polish in male mode. OTOH a quick visual poll of what GGs are wearing on their toes leads me to believe that color is almost required during sandal season so I almost always paint my nails before going out en femme.
I made an exception today because I was invited to visit a museum en femme and had another commitment right after that in drab. I went with clear polished toes that work in both modes because I only had a limited time to switch modes. It worked, but I sure missed having colorful toes!