[peterjs]

Are all these icons black-and-white? It seems to be fashionable to use monochrome colors for icons these days (Gmail, many mobile and desktop apps). It makes for a sleek and calm interface. I think its choosing the easy way out. Instead of picking a good pallet and shapes, just remove the colors and all of a sudden a seemingly unrelated set of graphics has something very distinctive in common (it worked particularly well for me in a small newspaper where low quality photos were contributed by different authors, just make them grayscale, voila).

Really, color is such a great way to convey information.

[JohnTHaller]

These are for use in menus, submenus, notification areas, toolbars and the like. Locations where you'll be presented with a few choices that are easily distinguishable. They're not designed to be app icons. They're designed not to distract away from the rest of the app, especially the content.

[yourad_io]

I think it would be trivial to do this modification, seeing as the icons are provided in SVG format (alongside the more static PNG)