Can you see her long green hair falling down the stairwell? I liked Wizzle's "Circuit" so much that I had a hard time changing it. I finally deleted her first and third layers. Working only with the second layer, I changed the function, added a new identical layer and rotated it 90 degrees right. I repeat this process until I had 4 identical layers that formed an equal square. I especially like the way her colors became richer and richer with each "tweak." 

This was the first time I used Mark's fBm Popcorn Trap coloring algorithm. I'm hooked! To tell you the truth, I don't know what I changed. The functions and an additional layer or two for certain. The other parameters - a tweak here, a tweak there. And I moved it from the Wizzle range of rich burgundy and purple to Gumbycat-oranges. This was fun! 
 

Working on this Wizzle image took a great deal of restraint. The harlequin spiral lended itself perfectly to any coloring algorithm I changed or added. In the end, I made no change to her first layer. I changed the function, merge mode, and gradient file in her second layer, and I replaced the ucl file in the third layer. When I was done, I zoomed in slightly to eliminate a color blur on one edge. 
 

I changed the gradient file in Wizzle's first layer, made a minor change in the gradient file of the second layer, and replaced the ucl file in her third layer. When I was done, I zoomed in and focused on one of the spirals. 

(P.S. This is my favorite tweak - wizzle) 

(I think she likes it because those are her colors - gumbycat)

I like the feeling of movementWizzle's original had, and I think I lost some of that in my tweak. Mine is more static. It bristles, like fins on a tropical fish. In the first layer, I made one minor change in the parameters of the ucl file Wizzle used, and modified her gradient file. In the second. I made one VERY minor change in the gradient file she used, and changed the merge mode. I replaced the third layer's ucl file. 

In Wizzle's first layer, I made a colormap change. I replaced her other three layers. 

When I was playing with this one, I started using transformations, masks, and zooming around, and ended up with some very surprising differences! They beg the issue "derivative work or original image?"