8
\documentclass{beamer}
\usetheme{Rochester}

\setbeamertemplate{block title}[horizontal shading][left=black, right=white]

\begin{document}
\begin{frame}
  \frametitle{MWE}
  \begin{block}{Title}
    Test
  \end{block}
\end{frame}
\end{document}

The template sidebar canvas left can be set in this fashion; is there any way the same can be done for block titles using templates?

10

Unfortunately, due to the way boxes are built in beamer (take a look at the definition of \beamerboxesrounded and \endbeamerboxesrounded in beamerbaseboxes.sty to see how different chunks are pieced together to build a box), this would require a major rewriting of the code producing the boxes and quite frankly I am not sure if the work is worthy the effort.

You can however, get this effect using the beamer skin for a tcolorbox and a convenient definition for interior titled code using \shade; something along these lines:

\documentclass[dvipsnames,svgnames,x11names]{beamer}
\usetheme{PaloAlto}
\usepackage[many]{tcolorbox}
\usetikzlibrary{shadings}

\newtcolorbox{myblock}[1][]{
  beamer,
  width=\textwidth+7pt,
  enlarge left by=-3pt,
  colback=structure,
  colframe=block body.bg,
  bottom=0pt,
  top=-2pt,
  left=0pt,
  right=0pt,
  toptitle=-1pt,
  bottomtitle=-1pt,
  fonttitle=\normalfont,
  adjusted title=#1,
  interior titled code={
    \shade[left color=Maroon!80,right color=Dandelion,middle color=Salmon] 
      (title.south west) --
      (title.south east) {[rounded corners] -- 
      (title.north east)  -- 
      (title.north west)} --
      (title.south west); 
  }
}

\begin{document}

\begin{frame}

\begin{block}{The title}
This box ia a box provided by the \texttt{beamer} class.
\end{block}

\begin{myblock}[An example with \texttt{tcolorbox}]
This box looks like a box provided by the \texttt{beamer} class.
\end{myblock}
\end{frame}

\end{document}

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