I really like the looks of that scarf! The smaller weft & loose weave really shows off the warp!
I've done somewhat of the same when I've gotten to the end of my project on the loom and still had plenty of warp left. I'll use up bits and pieces of handspun of various sizes and colors and make a table runner or place mats or coffee rugs.
Here is the first one I did

I'll also use left over sock yarn to make 'Mojo' socks

And I've been known to make a few rectangular shawls using a combination of garter stitches and random rows of drop stitches out of small amounts of handspun.