@s1mmxn3 I believe @kellylane6 used a variegated floss for the colored stripe. In other words... it's still just one strand of floss, but the strand itself changes color randomly. There are lots of different brands with variegated floss options, and I'm pretty sure @KrazyKnotz has a tutorial on how to dye your own variegated floss. It's really an awesome effect!
wiland
