Think the moon is a blue moon, a single elephantine sapphire.
The blue moon was setting, and soon, they knew, it would be day.
Tis a sweater, and sure theres a blue moon on the front, in the bargain.
“She does get a brilliant idea once in a blue moon,” laughed Peggy.
A stranger in these forgotten villages is as rare as a blue moon.
"I don't see you once in a blue moon ...