The themes of adult coloring books are usually intricate and centered more around adult images, not your childhood counterparts that included bunnies, super heroes, and farm animals. You would expect to see geometric patterns, psychedelic patterns reminiscent of doodle art type pages, fantasy images including angels, dragons, goddesses and mermaids, and ancient designs of religious and spiritual nature.
Those that really like to color are going to be looking for printable coloring pages all over the place so that they dont have to drive all over creation looking for that special coloring book. If you and/or your kids really like SpongeBob Squarepants, you will like looking for SpongeBob coloring pages so that you can make your own custom-made coloring book or books from SpongeBob printable coloring pages. Are you aware that there are a good many adults that really love to sit down and color when they have a few moments to simply sit down and relax? This is something that you might not be aware of, but really need to think about because it happens every day somewhere in this big world of ours.