Take a ball of yarn ~ any old yarn. Preferably, a ball that has been hidden in the deep dark recesses of your yarn box(es). Yarn that has already served its purpose in another project or two. A scrap that is no good for any project ~ not even a woven square.
Then take some more yarn. Something that has no purpose either. Make sure it's junk. I mean something that's been in the bottom of the box for quite some time. Ugly, scratchy stuff.
And finally, take a third skein of unwanted variegated 100% acrylic yarn that you just want to get rid of but don't want to throw away since you've saturated all your friends with unwanted yarn and they can't/won't take ANY MORE!
Linen Stitch Scarf