Even the regular dollar symbol seems to be based on a "serpent coiled around a cross", which pharmacies sometimes display. If I start digging around on the Net, I'm sure to find all kinds of occult/religious/pagan history surrounding it.http://en.wikipedia.org/wiki/Rod_of_Asclepius
How about a Tetris-like "B" in bright colours? I know it's a bit Google, but Google is popular, whereas shiny bullion-like designs remind of dodgy poker sites.
Sometimes also the similar Caduceus is used, both are Greek. "Pagan" is a christian word for "people we're going to torture and make into second-class citizens of christiandom".
The BTC symbol reminds me of the "beli" symbol used on One Piece.
The "staff" going through it isn't any more meaningful than the rod going through a treble (G) clef symbol.
Only the "double staff" that makes the U in U$ has any particular meaning on a currency that I'm aware of.