Here's an interesting discussion of Sierpenski Triangles:
http://social.msdn.microsoft.com/Forums/en-US/smallbasic/thread/15a4a5bf-98d8-42f9-93ce-7246ef584a2c
Here are two examples that were created in Small Basic:
Random Sierpinski Triangle - by RubikWizard
Sierpinski Triangle - by Stendec
NaochanON created this program that generates these triangles:
http://smallbasic.com/smallbasic.com/program/?RBB339
And this diagram for an explanation:
Enjoy!
- Ninja Ed