Wikipedia Article About Fusilli on Wikipedia
The word fusilli presumably comes from fusile, archaic or dialectal word for "rifle" (fucile in modern Italian), referring to the spiral-grooved barrel of the latter. The word can also mean "little spindles" in standard Italian.
Green and red varieties of fusilli (or any pasta) are created by using spinach or beet juice, respectively, instead of water. There are also whole wheat versions of fusilli available.
Fans of the show will remember fusilli referred to in a Seinfeld episode when Kramer makes an honorary statue of Jerry out of fusilli (which was actually rotini).