In the past, I may have been a more creative person than I am now. However, just as the past accumulates and I become who I am today, the algorithm I worked on in the past (http://fl.corge.net/c/vlOo) gave me an answer now.

variations: 10 palettes, H value (lower is steeper, higher is gentler)

keyboard controls: [s] - Get a full resolution image of 1600 x 1600 px.