Material design’s color guidelines describe the color style as being “inspired by bold hues juxtaposed with muted environments, deep shadows, and bright highlights.” If you need to generate material design color palettes, these online tools will help. 1. Material Palette. In this tool, you start by picking your primary color and accent color. Color Gestures is the name given to changing the color of a Fill, Stroke, or Gradient Stop by dragging the mouse from a fill indicator into the Inkscape window. The principle is that as you drag the mouse, the color will change proportionally to the distance from a 45° line from the indicator.
I am using color palette in Inkscape, through the .gpl file format (GIMP uses the same format, according to DuckDuckGo) : GIMP Palette Name: Character/Dragon/Magma Columns: 3 #.