there's some talk going around that Russia, along with 3 other countries I can't recall (but it's not the BRIC group) is going to announce a new currency based on gold .... I don't know the truth of it, but it's feasible.
Sinclair rabbits on about 'gold certificates' as a means to reinstating gold backing for the US$ - but both the 'Amero' idea and the 'red back$' idea would put paid to that.