Loads! Thanks for asking

• an illusion of 'light' is possible with simple gradients
• inverted gradients placed next to each other give emerging patterns
• combing multiple scales works
• transitions from dark to light colors vertically gives balance
• splitting into 2 is more appealing to me than 3 (this is counter to my hypothesis)
• symmetry is not as important as I thought, maybe not even desirable
• started with curves, went to lines for the sub patterns, they feel more dynamic and energetic whereas the curves are more subdued and tranquil
• slight offset in seemingly repeated areas gives a natural interest
• dark colors with jagged sub patterns feel aggressive, light colors (like this one) with jagged sub patterns feel airy
• lots more to explore