worsted weight yarn
With coaster color, ch 16.
Row 1 - sc in 2nd ch from hook and each remaining ch, ch 1, turn.
Row 2 - sc in each sc, ch 1, turn.
Border - sc evenly around coaster, doing 3 sc in each corner, ss to first sc, finish off.
Embroider fireworks onto coaster in chosen colors, as shown.