turtlestamp

import turtle
turtle.bgcolor("lightgreen")
turtle.shape("turtle")
turtle.color("blue")

turtle.penup()
size = 20
for i in range(30):
   turtle.stamp()             # Leave an impression on the canvas
   size = size + 3            # Increase the size on every iteration
   turtle.forward(size)       # Move turtle along
   turtle.right(24)           #  ...  and turn