Generate a palette image file

make_palette_image.py

from PIL import Image, ImageDraw

length = 100
columns = 4

colors = """
whitesmoke gainsboro gray black
indianred lightpink tomato lemonchiffon
plum palegreen paleturquoise burlywood
peachpuff khaki slateblue teal
""".split()

def chunks(l, n):
    """Yield successive n-sized chunks from l."""
    for i in xrange(0, len(l), n):
        yield l[i:i+n]

colors = list(chunks(colors, 4))

width = columns * length
height = len(colors) * length
img = Image.new('RGBA', (width, height), (255,255,255,0))

draw = ImageDraw.Draw(img)

for i, row in enumerate(colors):
    for j, color in enumerate(row):
        x0 = j * 100
        y0 = i * 100
        x1 = x0 + 100
        y1 = y0 + 100
        draw.rectangle([x0, y0, x1, y1], fill=color)

img.save('palette.png', 'PNG')