"Natural and appropriate", eh?  Well, what if I were to toy around with the logo, and the next favicon would look something like this:

http://i1097.photobucket.com/albums/g352/kroptofer/bitcoinFace1.png

or this:   

http://i1097.photobucket.com/albums/g352/kroptofer/bitcoinFace2.png


or heck, maybe even -

http://i1097.photobucket.com/albums/g352/kroptofer/bitcoinMascot1.png

and a horizontal version:

http://i1097.photobucket.com/albums/g352/kroptofer/bitcoinMascot2.png

although instead of simply a favicon, I seem to have made a mascot. Imagine, he could be shooting at some real-world currency characters...alright I just spent way too much time on these, I think I'll go visit one of the geopolitical, socio-economic forums.