Ported from my cleanup (https://gist.github.com/jsundram/1671003) of analogpixel's sketch: http://www.analogpixel.org/blog/2011/09/13/msced-148-boxy-lady-take-2/#more-764 About as straighforward a translation of processing into nodebox as possible.

BoxyLady2.py

from nodebox.graphics import *
from numpy.random import randint # random.randint is v. slow
import numpy

MINS, MAXS = 1, 40
grow = False
box_size = MAXS
counter = 1

# Use a numpy array of pixels because pic.get is too slow.
pic = Pixels(Image('pic.jpg'))
pixels = numpy.empty((pic.width, pic.height), dtype=Color)
for x in range(0, pic.width):
    for y in range(0, pic.height):
        pixels[x][y] = pic.get(x, y)


def setup():
    canvas.fps = 30 # pipe dream, each frame takes a while.
    canvas.size = pic.size
    nostroke()
    canvas.run(draw)


def draw(canvas):
    global box_size, grow
    make(box_size)

    box_size += 1 if grow else -1
    if box_size <= MINS:
        grow = True
    elif MAXS <= box_size:
        grow = False
        canvas.stop()


def make(i):
    global counter, pixels
    for cc in xrange(pic.width * pic.height / 2):
        x = randint(0, pic.width)
        y = randint(0, pic.height)

        rect(x, y, randint(MINS, i+1), randint(MINS, i+1), fill=pixels[x][y])

    # Would love to use canvas.frame, but it doesn't advance properly
    canvas.save('nb/image%03d.png' % counter)
    print canvas.profiler.framerate
    counter += 1


if __name__ == '__main__':
    setup()