The Golden Ratio is also called the divine proportion. Artists, Scientists and Architects have been using the golden ratio for thousands of years. In webdesign it is also a basic practice to adhere to the Golden Ratio to make a design pleasing for the eyes.
If you never heard about it: more about the golden ratio in webdesign and also read something more about it on wikipedia.
One of the principles is that the Ratio (1.68) is repeated in the design, like you find in many places in nature.
So for the social bookmark icons inside a professional design I have created a basic pack of social bookmark icons that adhere to the 1:16.8 ratio (also called φ). You can use them in golden ratio design to further repeat the pattern downwards.
License
The icons are released under Creative Commons 3.0 and you are free to use them on your website.
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Thank you very much, I really really like your button designs.