Freebie Bitcoin Icons
Use these free icons however you like. I made them and am giving them away. Pixel perfect, with subtle gradients. Right-click and select "Save image." I hope to expand this set more when I get time.
Rocket in the stars icon (When moon?)
Lambo icon (When lambo?)
Bitcoin Symbol Icon
If you know your way around photoshop, get a copy from the github repo and please don't feel shy about creating a pull request with your own icons:
https://github.com/jdabs/crypto-icons/blob/master/btc-icons.psd