One of the awesome things about Canada is the $1 and $2 coins. Unlike certain countries with their Susan B Anthony dollars, we did it right: the loonie (so named for the bird on the back) is a little bigger than a quarter and sort of a dull brass color, and the toonie (by extension from "loonie" although they missed a trick not calling it a "doubloon") is slightly larger than that and two-tone, so they're easily distinguishable from a) existing coins and b) each other.

Also we just now got rid of the penny, too. I'll let you know how that goes.