This colouring book, which is designed for grown and semi-grown people will provide many hours of fun. Great for long flights, stress relief, recovering from illness or just plain enjoyment of the art. Bought one for myself, then immediately bought two more for my mother and niece after seeing it in person.
The author suggests using coloured pencils or Staedtler Triplus Fineliner pens. Glitter and metallic pens (not markers) also fantastic.