Here's a sketch of the firey quilting pattern I used on the Gradient quilt, as requested!
This pattern is mostly vertical wavy lines. When the lines change direction they do so at a point or with a little flame lick. I quilted the pattern in vertical columns 8-10" wide, starting with the middle. Starting quilting in the middle is so great, because it's all downhill after that. Less and less quilt under the machine as you go along.
It took sketching about three or four big sheets of paper with this pattern before I was ready to stitch it. Stitching went smoothly and I rarely felt "stuck". It's a very forgiving pattern! Keep in mind as you go to vary the placement of your direction changes. Don't let them all line up with each other horizontally or you will get this weird little row of points coming together.
You could definitely make this pattern "hotter" if you wanted to, by adding more flame licks.