I present new tools to play and experiment with!
The second is Kaleidoscope Painter:
First, I used GIMP's Fuzzy Select tool to extract part of the mandala image, and pasted it as a separate layer on top of the kaleidoscope image. Keeping the two as separate layers allows me to manipulate them independently. For the kaleidoscope layer, I used the Neon edge detect filter again, and faded it a bit so that it didn't go straight down to the outer edges. I also used the Pinch and Whirl distortion filter and generated Plasma renderings around the pattern, also fading the filter.