Australian children 's book author and illustrator Irena Sibley produced three Easter Bilby books between 1994 and 2000 including the best selling The Bilbies ' First Easter . Australian children 's book author and illustrator Irena Sibley produced three Easter Bilby books between 1994 and 2000 including the best selling The Bilbies ' First Easter , Silver Gum Press 1994 .