We all possible hues with colorsys library to draw a very colorful Penrose tiling.
Colorful Penrose Tiling with Python Turtle
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Café Wall Illusion with Python TurtleCafé Wall Illusion with Python Turtle
All lines are actually parallel! For more information about this illusion check out Wikipedia page.
Yellow FlowerYellow Flower
Draw a yellow flower with 5 petals. Check here to find an easier project that draws a single petal. Also check out the tutorial on drawing a single petal.
Hering Illusion with Python TurtleHering Illusion with Python Turtle
Similar to Cafe Wall illusion, the red lines are actually parallel. Read more about this illusion here.