Well, kind of a twisted journey on this one. The line that came to mind was “Not all that glitters is gold”, which is apparently Shakespeare, Merchant of Venice. But what I thought I was thinking of was the line from Tolkien, Lord of the Rings, which actually goes “All that is gold does not glitter; Not all those who wander are lost.”  "Glitter" and "gold" being the key terms here -

Setting sun hits ice

on bare branches and glitters -

   but it is not gold.

Ok - for tomorrow we'll do something about gold that does not glitter, or wanderers who are not lost!