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Whoa, I never noticed the black eyebrows!
I am supporting this theory/speculation because it really sounds the most logical.
I guess the "inner conflict that can't be shown otherswise" thing makes the most sense so far. I like the idea.
They could have had one eye be blue and the other yellow, or maybe just have slight amounts of yellow around the iris. But then again, having such symbolism there seemed a little unnecessary.
The eyebrows look the same as Ven's in the trailer to me.
It's that small bit when you see Ven and Terra "turning away" after falling into the water/upside down.
Here too, Ven-nitas's honestly don't look that much darker considering the lighting.
Those upper blotches are hair comparisons, the lower ones are eyebrow ones. I was able to get dark brown out of Ventus-Vanitas as well.
I don't think it's possible to 100% it because of lighting differences so I'm going to go with "whatever"
Accoring to gimp, Ventus's eyebrows are around this color:
which is probably due to it being a Reflection, BUT:
Venitas's are this color:
And in this shot of Ventus, it is this color:
The difference is way more obvious here because Ventus is not blueish here overall.
Honestly I wouldn't look that much into it. Color codes chance rather quickly depending on which spot you select because of light/shadows and effect they use. I'm pretty sure it's dark blonde and I don't think it has anything significant to do with the 'symbolism'.