Those are little projects made using Processing an open source language and IDE to easily create images and animations. Its official site is at http://processing.org/.
I started using Processing in may 2010.
You will find below some descriptions of my various projects.
Click to generate a growing and fading disk. It is supposed to distract my 5 months old daughter :-D
Psychedlic moving boxes.
Bouncing balls. Did that using x86 ASM a looong time ago. Processing makes this way easier :-d
Not sure what it was meant for :-d Does not draw anything yet!