This is such an easy, mindless knitting pattern, and it gives you a nice, long/shallow, asymmetrical triangle in garter stitch that curves nicely around your neck as either a scarf or a shawl (depending on how big you knit it to be). It's a simple two-row repeat that's very easy to remember.
This one ended up being about 58 inches long finished length from tip to tip. I didn't have a full skein of this yarn (Red Heart Super Saver Ombre in the True Blue colorway) available, so I just knitted until what I had was about to run out and then cast off.
You can make this with any yarn weight at any gauge, just choose a needle size based on your yarn size that gives you a fabric with a nice drape (not too stiff). To begin, cast on 5 stitches. Row 1: kfb, kfb; knit to last 2 stitches; k2tog. Row 2: knit.
That's all there is to it! Just keep repeating those two rows until your scarf or shawl is as big as you'd like. I recommend using a stretchy cast off, such as: Knit the first stitch; slip the stitch you just knit back onto the left needle; then knit two stitches together through the back loop. Repeat by slipping that stitch back to the left needle and knitting two stitches together through the back loop until all stitches are cast off.
As you can see, I have knit this type of scarf a few times before:
