Python Imaging Library/Image Tiling

import Image

img = Image.new( 'RGB', (255,255), "black") # create a new black image pixels = img.load() # create the pixel map

for i in range(img.size[0]): # for every pixel:

   for j in range(img.size[1]):
       pixels[i,j] = (i, j, 100) # set the colour accordingly

img.show()