These pictures are generated by Fractree

Fractree is obtained from here.

Koch Curve

Hilbert Curve

Dragon Curve

A Stylish Tree

Cross

[IMG]bush2.gif 
[IMG] bush3.gif 
[IMG] bush4.gif 
[IMG] curl2.gif 
[IMG] dragon.gif 
[IMG] grass2.gif 
[IMG] hex.gif 
[IMG] hilbert.gif 
[IMG] island.gif

Reference:  "The Science of Fractal Images" by Pleitgen and Saupe (editors), 1988, Springer Verlag, New York, pp. 273-286.