Ah the English language and its colloquialisms. Now is the time for all good posters to come to the aid of their language. Time to mix your metaphor. A little saying here, a dash of language there, and spice it up with a hanging participle.
As subtle as a pin drop in church.
Use one stone to kill a bird in the hand better than one in the bush.
It is time to fight fire with that spark of love.
As sharp as a tacky knife.