UK Edition. Relax with this 25 Abstract Patterns For Stress- Relief: Adult Colouring Book. Each page has been printed one-sided in order to prevent bleed-through. The patterns vary in detail and feature both thick and thin lines. Test your colours on the Colour Test page. Suggestions: Experiment with colour schemes, place a sheet of paper between the colouring pages. Colour and frame your favourite pattern. Happy Colouring!