Shaun of the Dead is a great movie, the best of silly British comedy. These decorations are zombies crawling out of the ground (if you use your imagination!) Colour a weird green for that extra effect.
Dip one end of a cocktail stick in green food colouring (I just used the cheap liquid variety). Rub the end of the cocktail stick in a ball of white ready roll icing and knead until the colour is fairly evenly distributed.
Roll into small balls on a piece of clingfilm and flatten into discs. Cut fingers out with a sharp knife, placing the disc flat on the clingfilm. Remember to leave a gap between the thumb and the next finger. Round the fingers out fingers by squeezing them gently.
Cut a piece of a drinking straw about 2cm long. Push 1cm into the zombie hand very gently leaving 1cm out for pushing into the cupcake so the hand 'stands up'.