The icons used system for Mac OS X Lion (Leopard and later) have a resolution 512 × 512 pixels, a detail which makes them suitable for use in your documents, for example.
Most of the icons of Mac OS X 10.7 Lion can be found in Computer / System / Library /CoreServices. In this folder you will find the file CoreTypes.bundle, with control click and hold (or right mouse button) and from the context menu select Show Package Contents. In the new window should open Contents and then resorces. At this point, setting the window view Cover Flow option, you can quickly scroll through the icons (file.incs). Double click on that interest and will open in Preview. To use an icon in Preview just save it in the formatthat best suits your needs.
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