Tie the ends together to make a ball of yarn so you can use it as a weft .
There’s a Japanese word for this which I can’t recall at the moment..
I use them for choke ties..
And if the finished item is a gift, I’ll bundle up several together then tie end to end to make a thicker “ribbon” to wrap the woven gift. I also use the bits from where you tied on to apron rod. They make. nice bundled bow especially post wash. I hope this makes sense.