color-scalable
pixel-perfect 16x16
gimp-gradient-bilinear
gimp-gradient-conical-asymmetric
gimp-gradient-conical-symmetric
gimp-gradient-linear
gimp-gradient-radial
gimp-gradient-shapeburst-angular
gimp-gradient-shapeburst-dimpled
gimp-gradient-shapeburst-sherical
gimp-gradient-square
gimp-gradient-spiral-clockwise
gimp-gradient-spiral-anticlockwise