Take a short length of fleece in a color to match the center. Roll it between your hands to make a short snake.
With your felting needle, and being careful not to stab the earbud cable, attach the fleece snake to the flower center on one side of the earbud base. Attach the fleece to the other side. Run a little bit of the fleece around the top of the earbud, so that the flower will not slide down the cable while you are wearing it. Tuck in any ends and secure them with the felting needle.