I'm wondering if age has an effect here too. JJJ's comment might be indicative.
The first time I saw Orion's nebula was when I was 12/13yrs and using a 70mm refractor. It was very distinctly green. It continues to be green in an 8" dob and 6" refractor, though not as strong.
At the primary school star party I attended last winter I asked 5-6 people what colour they saw in Orion. The older ones said none the younger ones said green. One said blue.
It's an interesting subject.
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