Link Dump 2010.01.10While not particularly decorative, this is visually interesting. It's a rope trick (and it's definitely a trick, watch her hands carefully. Here's the video:
http://www.math.toronto.edu/~drorbn/Gallery/KnottedObjects/WaistbandTric...

Here's a line diagram of what's happening from Kauffman's On Knots (page 98-99) via Google Books
http://books.google.co.jp/books?id=BLvGkIY8YzwC&pg=PA98