After two iterations of the runners based on Bateman Park weaves, I was totally bored and decided to weave off the remainder of the 8-shaft warp in plain weave with a hemp weft from my stash.
To the bitter end!
And then I cut it off (cutting-off photo credit to Bruce):
After hemming and wet finishing, here's one of the runners on the porch floor:
The plain weave section yielded two nice towels.