So when you replace tools' icons in GIMP's GTK3 branch with symbolic ones that +Barbara Muraus and +Jakub Steiner did last year, this is what it looks like. The are plenty more icons ready to replace the old ones, I just haven't used them.

Some icons are still missing (newer tools, selection add mode etc.), and most, if not all icons are finetuned for 16×16px size, so they are not pixel crisp in 22×22px size. But that still looks infinitely better to me.
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