Crumple a small ball of tissue paper or polyfill about the size of a large marble. Place it in the centre of a coffee filter and gather the filter around it, twisting the filter below the ball to form a round head with a ruffled skirt below.

Draw two oval eyes and a small open mouth on the rounded head with the black marker. Keep the face simple; a shocked O-mouth expression is easier to draw than a smile and looks very effective.

Punch a small hole through the gathered twist at the top of the head. Thread the string through the hole, spacing the ghosts about 15 cm apart along the string.

Repeat for all twelve filters, threading them onto the string as you go. Tie a loop at each end of the string for hanging.