I was hacking away on a program that generates geodesic dome geometry, and for debugging purposes wrote some code that outlined all the faces on the dome. While looking at the output, it occurred to me that it looked like a sheet from a coloring book. I played with it further, and realized that by tweaking the code a little, I could generate Sierpinski triangles mapped onto a sphere.
So, just for kicks, I generated some images that should be high-resolution enough to print out and color. Click the thumbnails below to download the images.