Each label: chain 14. Work in rows of sc, 12 stitches wide, for 8 rows. Fasten off, leaving a 20 cm tail for attachment. The label is a small rectangle approximately 5 cm x 3.5 cm.
Embroider one motif on each label using black yarn. Skull: a circle of chain stitches for the head, two small French knots for eye sockets, and a short horizontal straight stitch for the jaw. Moon: a crescent of short straight stitches, thicker on the outer curve and fading to nothing on the inner. Spider: an oval of chain for the body, 8 short straight-stitch legs radiating out. None of these needs to be precise; the rustic quality is the point.
Thread thin twine through the top two corners of each label (use the yarn needle to open a gap between stitches). Tie the label around the neck of a bottle with the twine, adjusting until the label sits flat and centred on the front.
Arrange the bottles in a cluster of three at different heights. Fill them with coloured water, dried herbs, or sand for visual interest.