LeT operative David Coleman Headley, who conducted the recce in the 26/11 Mumbai blasts has a condition known heterochromea -- where the colour of both eyes are different. Headley as must've noticed has one brown and one blue eye.
If you believe in handwriting analysis, visit this link, which analyses Headley's handwriting. But remember the analyst or whatever it is they are called, has the entire history of Headley to help him.