Convex combinations of colors:

@Code \def\mycolor{blue!30!cyan}

@Code \foreach \n in {1,2,...,\NN}
@Code {
@Code    \tikzmath{\d=3*\n/\NN;}
@Code    %Convex combination of colors
@Code    \tikzmath{\dc=100*\n/\NN;}
@Code    \def\col{blue!\dc!cyan}

@Code    \DrawParallel{-3}{3}{200}{\d}{\col}
@Code }