Mandala is known worldwide symbol of universe and it is mostly known in Indian regions. I think that mandala coloring pages are more for adults than they are for kids. Please see below for some of the best mandala coloring pages.
see site for many more - 1895 - Cusack's freehand ornament. A text book with chapters on elements, principles, and methods of freehand drawing, for the general use of teachers and students . by Armstrong, Charles