I've made a simple one just to test the colors:

http://img543.imageshack.us/img543/4386/bittiraha1.png

What do you think? I designed the Bitcoin logo myself. It's very similar to the original.

EDIT: I forgot the ".fi" in the first one.

http://img338.imageshack.us/img338/4386/bittiraha1.png

http://img638.imageshack.us/img638/1543/bittiraha2.png