I had many yards of a single ply left over from a box of Wellington Fibres roving, so I decided to spin it with a commercial yarn. That's a great way to make the most of handspun, and definitely easier than trying to get a two-ply out of a single bobbin.
It turned out pretty nice, but it's a bit overspun. I was thinking of running it through the wheel again for a balanced yarn, but I kind of like it with so much spring. Really, I'm still learning and every experiment at the spinning wheel teaches me something new.