Why use the old convention of putting the face of our rulers on our coinage? Graven images were used to indicate the power of the ruler "I am Caesar and thus created this coin" and even contemporary currency uses the signatures of various Ministers of the Exchequer, Secretaries of the Treasury etc. to "legitimize" the people using the Centralized Authorities instrument of value, produced, maintained, manipulated and controlled by them, for them and without our input as the people.
Bitcoin, and the family of alt-cryptocoins demolish that fabrication, and I would hold that we don't need to use the tokens of value to glorify any individual, or to acknowledge authority to control our wealth. If we want to have colorful images, let's celebrate that which differentiates cryptocurrency from fiat, it is technological superior, it is digital, it is decentralized and it is not backed by the full faith and credit (and might of...) any sovereign State.
Yep, I agree. It would be nice to present symbolic representations of this idea, and I would be open to any suggestions you have for this.