Hi, thanks. This image is actually comprised of 3 fractals that I've layered into each other using Adobe Photoshop and Lightroom. The fractals themselves were generated using Stirling 2 (It's incredibly easy to use, and free), the main fractal was generated using formula 8) in Stirling 2: 4th Order Nova Variation, sine_cosine. I can't remember what formulas I used for the others (they're fractals I generated over a year ago and simply had lying around in my textures folder), but you can achieve similar effects using the Lyapunov controls in Julia mode and then setting the colour Render to a higher level than seems sensible. I tend to use those kind of fractals as ways of adding noise to an image that's a bit more interesting than a standard film grain overlay.