you'll probably have to become a member to see this, but it's a simple scarf for you to use.
If you want to make the scarf thicker then use two strands. To do that you'll want to cast on with both strands and continue knitting like you would with one but use both. Make sense? O yea and if you're going to use two strands you'll want to use a bigger needle than if you were just using one strand.
You could always cast on however many you wanted to make it as wide as you wanted and then just knit the whole thing, that'd be pretty too.