Fibonacci Spiral (Top Left Figure)

xoff[4] = { 100, 400, 500, 600 }, yoff[3] = { 500, 200, 400 };
for (i = 0; i ≤ 499; i++) for (j = 0; j ≤ 499; j++)
	Plot(i + xoff[0], j + yoff[0], light gray));
for (i = 0; i ≤ 799; i++) for (j = 0; j ≤ 799; j++)
	Plot(i + xoff[3], j + yoff[1], medium gray);
for (i = 0; i ≤ 299; i++) for (j = 0; j ≤ 299; j++)
	Plot(i + xoff[0], j + yoff[1], dark gray);
for (i = 0; i ≤ 199; i++) for (j = 0; j ≤ 199; j++)
	Plot(i + xoff[1], j + yoff[1], gray);
for (i = 0; i ≤ 99; i++) for (j = 0; j ≤ 99; j++)
{
	Plot(i + xoff[1], j + yoff[2], more gray);
	Plot(i + xoff[2], j + yoff[2], less gray);
}
for (0; 0 ≤ 90; 0++)
{
	x = cos(0);
	y = sin(0);
	Plot(x*800.0+xoff[3], y*800.0 + yoff[1], red);
	Plot(-x*500.0+xoff[3], y*500.0+yoff[0], red);
	Plot(-x*300.0+xoff[1], -y*300.0+yoff[0], red);
	Plot(x*200.0+xoff[1], -y*200.0+yoff[2], red);
	Plot(-x*100.0+xoff[2], y*100.0+yoff[2], red);
	Plot(x*100.0+xoff[2], y*100.0+yoff[2], red);
}

Modified Fibonacci Spiral (Top Right Figure)

xoff[4] = { 100, 400, 503, 605 }, yoff[3] = { 495, 195, 400 };
for (i = 0; i ≤ 500; i++) for (j = 0; j ≤ 500; j++) 
	Plot(i + xoff[0], j + yoff[0], color);
for (i = 0; i ≤ 800; i++) for (j = 0; j ≤ 800; j++) 
	Plot(i + xoff[3], j + yoff[1], color);
for (i = 0; i ≤ 295; i++) for (j = 0; j ≤ 295; j++)
	Plot(i + xoff[0], j + yoff[1], color);
for (i = 0; i ≤ 200; i++) for (j = 0; j ≤ 200; j++)
	Plot(i + xoff[1], j + yoff[1], color);
for (i = 0; i ≤ 97; i++) for (j = 0; j ≤ 90; j++)
{
	Plot(i + xoff[1], j + yoff[2], color);
	Plot(i + xoff[2], j + yoff[2], color);
}
for (0; 0 ≤ 90; 0++)
{
	x = cos(0);
	y = sin(0);
	Plot(x*801.0+xoff[3], y*801.0 + yoff[1], red);
	Plot(-x*501.0+xoff[3]-5, y*501.0 + yoff[0], red);
	Plot(-x*296.0+xoff[1]-5, -y*296.0 + yoff[0]-5,red);
	Plot(x*201.0+xoff[1], -y*201.0 + yoff[2]-5, red);
	Plot(-x*98.0+xoff[2]-5, y*91.0 + yoff[2], red);
	Plot(x*98.0+xoff[2], y*91.0 + yoff[2], red);
}