Two links to investigate.
The first from my blogless friend Sue. She calls it "Feeding the Dark Side". I call it a really neat combination of math, crochet, and art. So, go here and check it out.
The second from blog mama, Teresa is called Romantic Math. The section starts with this quotation - "Beauty is the first test: there is no permanent place in this world for ugly mathematics." (G. H. Hardy) If nothing else it's an interesting use of functions. *grin*