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So I wrote a circle generator that I thought others might find useful. You can find it in my Github repo. You should be able to copy the class into your own projects and use it right away.

It can generate both normal circles and filled circles. It uses a custom Callable class so you can specify what you want to generate at each point in the circle.

Examples of Use

Circle.generate(x, z, 7, new CircleCallback()
{
public void call(int x1, int z1)
{
	 for(int y = mWorld.getTopSolidOrLiquidBlock(x1, z1); y < 100; ++y)
	 {
		 mWorld.setBlock(x1, y, z1, 98);
	 }
}
});

The above code generates a tower with a radius of 7 blocks on the surface that goes up to y=100. You can see the result here.

Circle.generateFilled(x, z, 8, new CircleCallback()
{
    public void call(int x1, int z1)
    {
         mWorld.setBlock(x1, 90, z1, 22);
    }
});

This code generates lapis lazuli discs at y=90. This is the result.

If you're interested you can check out how I wrote it at my blog.

Hope you find it useful and let me know what you think!

EDIT: Changed the name of the callback from GenerateBlock to CircleCallback

I wrote a Sphere Generator as well. Usage is very similar to the Circle Generator:

Sphere.generate(x, y, z, 7, new SphereCallback()
{
    public void call(int x, int y, int z)
    {
	    mWorld.setBlock(x, y, z, 22);
    }
});

This generates lapis lazuli spheres.