Nice looking logo with colorful elephant (and such) is one thing, but I believe what some currency are missing is to keep in mind the practical value of a *simple* monochrome denomination symbol (e.g. BTC).

The logo should be an appealing/marketing interpretation of a simpler/practical official symbol (should be like a font character that can fit in a few pixels).

I am not an artist, so I suggest here only a concept around two highly recognizable symbols: The dollar sign + the yin yang.

Graphically:
  - The dollar sign has a single middle line cut at the perimeter of the outer circle (do you see the yin yang?)
  - One can choose to enhance this into a marketing version with two reverse elephants heads (the ends of the S are the trunks and the two small half circles are the ears... do you see it?)



Just my humble contribution, not worth taking any credit. If any talented artists like it... then please feel free to derive something better.