The advantages of coloring pages:
1) Self expression - coloring on a blank "canvas" (notepad), is a method for kids and grownups alike to reveal themselves. You can tell a lot about the method an individual is feeling by the images that they draw, the colors that they utilize, and so on. It is important to give kids a possibility to reveal themselves, and not all kids reveal themselves through words and through writing, many usage art.
2) Color recognition
3) Therapy - for lots of people (myself included) coloring is restorative. Regardless of whether it's scribbling, or coloring the "best image ever", coloring can be a method to de-stress, after a busy morning of school work, wind down, and cool down, after the tensions of a day at school or work.
4) Grip/Control - many kids learn how to hold a pencil, pen, marker, or colored pencil, by first learning how to hold a crayon. The small muscles required for penmanship later begin to be established while coloring.
6) Building motor skills
7) Focus - Focusing on a single job for a length of time is necessary for coloring and for all sorts of things throughout one's life.
8) Limits - Another thing that kids learn from coloring pages, with preprinted images on them, is how to accept boundaries. While a young child or preschooler might scribble all over a coloring sheet, with no respect for the boundaries (lines on the coloring page), as the child ages, they will begin to appreciate those lines, and make an effort to color in between them. While I motivate blank paper coloring for free expression as often as possible, for many young children pre-printed coloring pages are their first exposure to printed boundaries. This early exposure to boundaries in print, will be a big aid when handwriting time happens, and the child needs to appreciate the boundaries of the preprinted handwriting lines on the paper.
9) Turning point - This is the last little "value" of coloring that I will point out in the meantime, which is that coloring in the lines is a turning point, a sense of accomplishment, the primary step towards an effective scholastic career for many kids. For many kids coloring in the lines is just as essential as counting to 10, counting to 100, reciting the alphabet, discovering the multiplication facts, etc. It's a turning point that says "yes I can" do whatever I discover, and it offers kids with pride, a sense of self worth, and helps them to feel accepted in a society that is often fast to judge, and slow to react. This sense of accomplishment will bring them through life, and assist them not to give up so easily, when something new occurs.