Some colourful shapes

import numpy as np
import matplotlib.pyplot as plt
from matplotlib.patches import Polygon, Circle, Rectangle

red, blue, yellow, green = '#ff0000', '#0000ff', '#ffff00', '#00ff00'
square = Rectangle((0.7, 0.1), 0.25, 0.25, facecolor=red)
circle = Circle((0.8, 0.8), 0.15, facecolor=blue)
triangle = Polygon(((0.05,0.1), (0.396,0.1), (0.223, 0.38)), fc=yellow)
rhombus = Polygon(((0.5,0.2), (0.7,0.525), (0.5,0.85), (0.3,0.525)),  fc=green)

fig = plt.figure()
ax = fig.add_subplot(111, facecolor='k', aspect='equal')
for shape in (square, circle, triangle, rhombus):
    ax.add_artist(shape)
ax.xaxis.set_visible(False)
ax.yaxis.set_visible(False)

plt.show()