A dragon curve in pretty colours, produced by a floor turtle.

dragon.py

import turtle as t
from math import sin, pi, log

f = 1
l, r = True, False

t.reset()
t.speed(0)
t.hideturtle()
t.bgcolor(0, 0, 0)

i = 0
t.forward(f)
ds = [r]
while True:
    if i >= len(ds):
        ds += [r] + [not d for d in reversed(ds)]
    h = log(i + 1)
    t.pencolor((sin(h)+1)/2, (sin(h+(pi*2/3))+1)/2, (sin(h+(pi*4/3))+1)/2)
    if ds[i] == l:
        t.left(90)
    else:
        t.right(90)
    t.forward(f)
    i += 1