Koch Snowflake
Level 0 — Equilateral triangle
F → F+F--F+F
Dragon Curve
Folding a strip of paper in half repeatedly
L → L+R+, R → -L-R
Sierpinski Triangle
Self-similar triangles at every scale
A→B+A+B, B→A-B-A
Hilbert Curve
Space-filling curve visiting every point
A→-BF+AFA+FB-, B→+AF-BFB-FA+