I’ve had the scarf pictured below for many years, and I still get compliments when I wear it. The following describes how to design your own scarf with left over yarn in your stash.
The best way to approach a simple DIY scarf is to collect all your yarn remnants that are similar in weight. For my scarf, I chose double knitting wool yarn. Decide on the finished measurements. My scarf measurements are approximately 7 inches wide by 66 inches long. The average scarf takes approximately 4, 50gram balls of yarn, and this helps in deciding on the quantity of yarn.
Now comes the fun part – making the swatch. Choose a needle size, taking into account the desired tension (loose or tight). The ball bands (if you still have them) are a guideline as to needle size and approximate gauge. I used a 4mm needle with the double knitting yarn. I like a simple rib pattern for scarves, so I chose a 2 by 2 rib or k2, p2. Decide on your color combination and knit up a large swatch, arranging the stripes as desired. You can determine the stripe arrangement ahead of time, by writing or sketching your design, or you can create as you knit by adding the colors as you see fit. As you are knitting the swatch, you may not like the color arrangement, or you may want to change needle sizes. This is what the swatch is for – to experiment. So be prepared to make changes. Once the swatch is complete, determine the gauge and write down the stripe sequence (number of rows that make up pattern repeat). My scarf pattern repeat is 13 stripes, 6 rows for each stripe. Also, if your gauge, for example, is 5 stitches per inch, multiply this by desired width 7 inches giving 35 stitches, and adjust stitch numbers according to pattern chosen. In my scarf, I wanted both edges to end with k2 on the right side, so in above example, you would cast on 38 stitches.
Now you can proceed to knit up your scarf. Voila, your own design!