Using Leftover Brewed Coffee on Plants?

This question goes out to LizCar and her suggestion on "aging paper" with coffee. How do you do it? I hope this reaches you, LizCar, as your idea sounds fascinating.

This is what I do to give letters or notecards an aged look: I light a votive candle and set it in the sink. This way you can keep both hands on the letter paper and have better control. A good distance above the paper (and MOST IMPORTANTLY in the sink-I can't stress this enough) very slowly let the flame discolor the paper moving the paper constantly. At times, I only want the edges ragged, so I let a tiny bit of paper catch fire then immediately blow it out until I have the entire perimeter jagged. I then take an old toothbrush and clean up the sooty, burnt areas. To make it look even more authentic, let parts of the edges of the letter/notecard burn more than others. I usually write my letter or note BEFORE I age the paper, so give yourself extra blank margins. Did I mention to DO THIS OVER YOUR SINK?? Letter writing is NOT a lost art, if we don't allow it to be. Your next letter or note will be charming, original, and a joy to receive.