Oh yeah, the blogger/HN identical orange favicon problem :-)
What's worse for me is when apps/favicons use a single letter, leaving me only typography for discrimination (for example the google "g" and the guardian.co.uk "g" get me every time). There's enough of them around that I am starting to get collisions.
That said, none of the icon pages on my iphone are dominated by a single color. The closest I get is one page with just under half the icons being mostly brown, which surprised even me.