It depends how many balls you have left of the yarn, a scarf or shawl might need more than you have if it’s left over yarn from another project. You can work out how many meters you have from the ball band and compare with how many meters are needed based on the meterage per ball of the suggested yarn in the pattern multiplied by the number of balls needed.
How about a small shawl which is worn as a scarf?
Here’s a link to small knitted shawls on the Drops site.
You can also browse large shawls and scarves, all free and there’s a facility to save your favourites for free too. Make sure to click the knitting button or you will get crochet patterns too.
As it’s a scarf or shawl you needn’t look for patterns only in the same weight yarn as you have, a pattern in a lighter or heavier yarn will work too, it will just come out a different size, i suggest you use the needle size on the yarn band rather than what it says in the pattern if you do this.
Drops patterns frequently list a circular needle even when the work is flat, you can use straight needles for a scarf or small shawl, the listing for circular may be to ensure the stitches fit in the needle but if you check the pattern and what the highest number of stitches is then you can work out if it will fit in your straight needles, for instance the first of these two links has a cast on of 5sts, increases to 31, then decreases to 5, 31 stitches will fit a straight needle. A large scarf might have 272 sts and not fit a straight needle unless you have very long needles.
Here’s a couple of suggestions