This is a great, easy pattern for 5 basic shawl shapes: Square, Circular, Triangular, Semi-Circular, and Heart-Shaped. http://www.laylock.org/?s=5+basic+shawl+shapes
Each style begins with casting on three stitches and is worked to a full-sized shawl or stopped at any point for a smaller scarf, which I did. The pattern calls for garter stitch but can be made in any stitch or pattern you choose (be sure to knit 5 stitches on each end of each row to keep edges from curling). The size will depend on what yarn/needles are chosen.
I made a child’s size triangular scarf out of scraps of baby yarn (above) and an adult sized scarf with a vintage button added.
Note that the scarves are worked top-down and the beginning three stitches will form a part of the top of the scarf.
This is a fun project and a good way to use up small amounts of yarn.