Start by selecting your bottles and cutting them down to your desired size. Use a piece of emery paper to soften the sharp edges.
To make the lid, use a scrap of solid wood (this is poplar) and a hole saw fitted to an electric drill. If you have access to a drill press, it's a bit easier to control, but any drill will work. You'll need 2 hole saws, one a bit bigger than the outside diameter of your bottle, and one the exact size of your bottle. Miss Ginger used a 3- 5/8" and a 2-3/4". Start with the larger saw, and cut into the wood just far enough to mark your circle. Don't cut all the way through the wood yet, but it's okay if the pilot bit goes all the way through.
Once the channel is cut, return to the largest blade, center the pilot bit, and cut the lid all the way through. If you are making multiple lids, perform all the cuts with each blade in sequence, to avoid changing the blade every time!
Sand the lids down, spray with a clear polyurethane, and add a decorative knob to the top. Now your jars are ready to fill with special treasure for yourself or as a thoughtful gift!