It was a family custom to turn all your coins over on the New Moon, just go in your wallet or coin purse (this was usually a female thing) and shake out the coins, then return them with the other side up. I guess you could take out notes and straighten them, and turn them round so they face a different way.
This is also the last New Moon before the Solstice, making the next fortnight the last time this year both “lights” will be increasing, so bear that in mind for Solar magick and growth magick in general.