drawblocks.py

import os

from PIL import Image, ImageDraw
import numpy as np


os.chdir(os.path.split(__file__)[0] or '.')

gsize = 100, 100
grid = np.random.randint(0, 2, gsize, dtype=np.uint8)
isize = 800, 800
i = Image.new('RGB', isize)
d = ImageDraw.Draw(i)
bw = int(isize[0] / gsize[0])
bh = int(isize[1] / gsize[1])
for x in range(gsize[1]):
    for y in range(gsize[0]):
        p = (int(grid[y, x] * 255),) * 3
        #d.rectangle((x * 8, y * 8, x * 8 + 7, y * 8 + 7), fill=p)
        d.rectangle((x * bw, y * bh, x * bw + bw - 1, y * bh + bh - 1), fill=p)

i.save('blocks.png')