Use a gradient as base color (like beamer@blendedblue)?

Question

I was asked to use two colors in a presentation. If it was only one color I would use beamer@blendedblue as base color, but since I need two colors, I can't use this. Is there a way to change the base color to a gradient?

Answer 1

You mentioned the Berlin theme in your comment. In my opinion this theme would not do well with gradients, as it lives from it's solid colour elements placed next to each other. Why not simply use your 2 colours for these elements? An example:

\documentclass{beamer}

\colorlet{color1}{green!60!blue}
\colorlet{color2}{blue}


\setbeamercolor{structure}{fg=color1}
\setbeamercolor{section in head/foot}{bg=structure.fg!50!color2}
\setbeamercolor{subsection in head/foot}{bg=structure.fg!75!color2}
\usetheme{Berlin}

\title{title}

\begin{document}

\begin{frame}
\titlepage
\end{frame}

\section{bla}
\begin{frame}
\frametitle{title}
    abc
\end{frame} 

\end{document}