As I was playing with the Week 4 Challenge, (such a great starting point that can last the whole week!) I tangled Afterglo, but then it came over me to round out the shapes made by the auras and strokes through the auras around the stars.
I continued the Challenge by adding it to my "Tangle*a*Day" desk calendar. Here is Afterglo (Day 10) before the rounding:
By rounding, I mean to round the corner of each little 'box' or stripe you see around the star. Each shape will get a little corner crevice filled in with black. The effect made me think of a butterfly wing, and also added a little (healthy-type) drama to the day of January 10:
It was tons of meditative fun to round all the corners inside the stripes. Try it out sometime with any tangle that has corners. Experiment to see what kinds of shapes emerge, and pay attention to how it changes the tangle!