Simply Quilts had a quilter featuring tube quilts. Her name was Rita Hutchens. Her book was called Totally Tubular Quilts. She has a website, just search her name.
I copied the instructions from the Simply Quilts website.
You may be able to find it by searching on Simply Quilts website. My pattern has the date 8-2-2006.
Haven't made a tube quilt yet. But looked like it would take a lot of fabric, and she cut the fabric several times, looked like there would be a lot of waste. (?)