Practical Pages has provided a number of coloring pages for kids that, I think, are just too cute! Each one is an outline of a famous piece of art. These will be great to add to our art center, but it is also a great resource for you parents to print some out.
The author of the blog also provides a simple tutorial on how to create your own outlines of other pictures.
She also provides several suggestions of different coloring methods like q-tips and blending.