The advantages of coloring pages:
1) Self expression - coloring on a blank "canvas" (notepad), is a way for kids and adults alike to reveal themselves. You can tell a lot about the way an individual is feeling by the images that they draw, the colors that they use, and so on. It is very important to offer kids a possibility to reveal themselves, and not all kids reveal themselves through words and through writing, many use art.
2) Color recognition
3) Treatment - for many individuals (myself consisted of) coloring is restorative. Despite whether it's scribbling, or coloring the "finest picture ever", coloring can be a way to de-stress, after a busy morning of school work, unwind, and calm down, after the stresses of a day at school or work.
4) Grip/Control - many kids find out how to hold a pencil, pen, marker, or colored pencil, by first knowing how to hold a crayon. The small muscles required for penmanship later on start to be developed while coloring.
6) Structure motor abilities
7) Focus - Paying attention to a single job for a length of time is needed for coloring and for all sorts of things throughout one's life.
8) Boundaries - Another thing that kids gain from coloring pages, with preprinted images on them, is how to accept borders. While a young child or preschooler might doodle all over a coloring sheet, with no regard for the borders (lines on the coloring page), as the child gets older, they will start to respect those lines, and make an effort to color in between them. While I encourage blank paper coloring for free expression as typically as possible, for many preschoolers pre-printed coloring pages are their first direct exposure to printed borders. This early direct exposure to borders in print, will be a big aid when handwriting time occurs, and the child needs to respect the borders of the preprinted handwriting lines on the paper.
9) Milestone - This is the last little "significance" of coloring that I will discuss for now, and that is that coloring in the lines is a milestone, a sense of achievement, the primary step towards an effective scholastic profession for many kids. For many kids coloring in the lines is simply as important as counting to 10, counting to 100, reciting the alphabet, finding out the reproduction facts, and so forth. It's a milestone that says "yes I can" do whatever I encounter, and it provides kids with pride, a sense of self worth, and helps them to feel accepted in a society that is typically quick to judge, and slow to respond. This sense of achievement will bring them through life, and assist them not to give up so quickly, when something new comes along.