create image from random colors

%pylab inline
BRUSH_STROKE_SIZE = 4
palette = imread('palette.png')
image = imread('starry-night-800.jpg')
png = np.ones(image.shape)
num_of_strokes = [1000, 10000, 100000]
for num in num_of_strokes:
    for index in range(num):
        row = np.random.randint(0, png.shape[0]-4)
        column = np.random.randint(0, png.shape[1]-4)
        color = np.random.randint (0, palette.shape[1]-1)
        png[row:row + BRUSH_STROKE_SIZE, column:column + BRUSH_STROKE_SIZE] = palette[0,color]
    imshow(png)
    figure()
    imsave(f"random{num//1000}k.png", png)