I have seen such curved lines at a blog two days ago.
I read The quilting Edge and like all works that Mari quilts.
She use quilt as you go technique and I Like it too much.
I think quilting on domestic sewing machine is horrible.
I promised I have to try.
So I have chosen two fabrics and began cutting.
This is not my first attempt in sewing curved lines so I was not stressed.
It was amazing as a journey when you are exploring a known country.
After sewing the first one I found many opportunities for next ones.
Finally I stopped after third. The quilting was fun.
Look at the results
First: Crossing rivers