Much like with your election woes, do you need us Canucks to come up with a dollar coin for you lot? Geez. It ain't hard people.

1) get a good solid weight coin bigger than a quarter and not round (has edges)
2) give it a different colour
3) slap a head of state on it
4) slap some symbol, animal, thing on the back so a cute nickname can be used

and the last most important step:

5) STOP MAKING ONE DOLLAR BILLS!

The dollar coin WILL NEVER catch on as long as dollar bills remain in circulation.

Simple. The invoice is in the mail.

Oh and for fuck's sakes make a two dollar coin too. Stupid singles.