Eclipse highlight occurrences, right column marker color

Question

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I use highlight occurrences a lot, but sometimes I\'m irritated by how hard it is to see the little grey-ish rectangles on the r

Answer 1

It used to take a restart(!) for the color modification to change for certain editors! (as in 2006), due to a bug in Platform UI.
But for current edition (3.4.x, 3.5.1), the General->Editors->Text Editors->Annotations preference page (the Occurrences item) should be enough to change on the spot any color settings you want.
After that, it depends on the nature of the editor (PDT editors used to miss that feature, until bug 166178 was fixed)