I like the look of those, but the home and Pictures icons don't quite work for me at first glance. The former just doesn't quite look like a house to me, and with the latter the black-on-black makes the outline a little hard for me to make out when I first look at it. I don't think it needs colors if the outlines are easily skimmable. Looking around at the rest of my desktop, I think the black and grey would go well with the rest of the standard Leopard interface.