The benefits of coloring pages:
1) Self expression - coloring on a blank "canvas" (notepad), is a way for children and adults alike to reveal themselves. You can inform a lot about the way an individual is feeling by the images that they draw, the colors that they use, etc. It is important to offer children a possibility to reveal themselves, and not all children reveal themselves through words and through writing, lots of usage art.
2) Color recognition
3) Therapy - for many people (myself included) coloring is restorative. Regardless of whether it's scribbling, or coloring the "best photo ever", coloring can be a way to de-stress, after a hectic early morning of school work, wind down, and calm down, after the tensions of a day at school or work.
4) Grip/Control - lots of children discover how to hold a pencil, pen, marker, or colored pencil, by very first learning how to hold a crayon. The little muscles needed for penmanship later start to be developed while coloring.
6) Building motor abilities
7) Focus - Paying attention to a single task for a length of time is required for coloring and for all sorts of things throughout one's life.
8) Limits - Another thing that children gain from coloring pages, with preprinted images on them, is how to accept borders. While a toddler or preschooler might doodle all over a coloring sheet, without any respect for the borders (lines on the coloring page), as the kid grows older, they will start to respect those lines, and make an effort to color between them. While I motivate blank paper coloring totally free expression as typically as possible, for lots of young children pre-printed coloring pages are their very first exposure to printed borders. This early exposure to borders in print, will be a big help when handwriting time comes around, and the kid 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 mention for now, which is that coloring in the lines is a milestone, a sense of accomplishment, the initial step towards an effective academic profession for lots of children. For lots of children coloring in the lines is just as important as counting to 10, counting to 100, reciting the alphabet, learning the multiplication facts, etc. It's a milestone that says "yes I can" do whatever I encounter, and it offers children with pride, a sense of self worth, and assists them to feel accepted in a society that is typically fast to judge, and slow to react. This sense of accomplishment will carry them through life, and help them not to give up so quickly, when something new comes along.