I've tried bobbin work and hate it. It's just a mess for me. I didn't get the second bobbin case and had to have mine adjusted. Thread got all tangled in the bottom of machine and I had to clean for the longest time....more than once, I might add. Nope no bobbin work for me, too stressful.
However I love couching....have done cording, beads and strings of beads, odd little finds, etc. on some art quilts. It can be lots of fun.
I've also done lots of thread painting, which is sewing a contrasting color thread back and forth to create another dimension to the quilt. That was lots of fun, also.