[masswerk]

Color coding any executables in file managers (in an otherwise reserved color) should be a standard.

[_dain_]

Colourblind employees would then become a spearphishing target.

[mafuy]

No. Colorblindness does not mean that one does not see any colors. There is only a tiny fraction of colorblind people who really cannot see any colors, and even they can still spot different luminances.