Background is transparent but shown with one of your colors here. 4 variations. Frame size is 2000x2348 in case you need it larger for options/edits. The coins are not my creations but both can be used, the first Euro version is creative commons with rights to adapt and the second version with the ฿ sign is creative commons public domain. The color of the droid can easily be changed, as can the white stroke around the entire thing.

http://i.imgur.com/IUk6AHM.png

Includes all files associated with the work including the PSD's.

http://i.imgur.com/NvT7hsb.png

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Links to creative commons coins as proof of their status:
https://commons.wikimedia.org/wiki/File:Bitcoin_euro.png
https://commons.wikimedia.org/wiki/File:Bitcoin_Digital_Currency_Logo.png