[Tex/LaTex] rounded and not rounded blocks

Question

I would like to know if it is possible to have to different kinds of blocks and how to do it in beamer.

As an example, one rounded for examples and one not rounded for theorems.

Is it possible to do this ?

Thanks

Answer 1

Shamelessly combined from this nice answer by samcarter and this nice answer by samcarter. Only improvement: load the tikzmarmots package (by samcarter).

\documentclass{beamer}

\useinnertheme[shadow=true]{rounded}
\usepackage{tikzmarmots}
\usepackage{etoolbox}

\setbeamercolor{block title}{use=structure,fg=structure.fg,bg=structure.fg!20!bg}
\setbeamercolor{block body}{parent=normal text,use=block title,bg=block title.bg!50!bg}

\setbeamercolor{block title example}{use=example text,fg=example text.fg,bg=example text.fg!20!bg}
\setbeamercolor{block body example}{parent=normal text,use=block title example,bg=block title example.bg!50!bg}

\addtobeamertemplate{proof begin}{%
    \setbeamercolor{block title}{fg=black,bg=red!50!white}
    \setbeamercolor{block body}{fg=red, bg=red!30!white}
    \setbeamertemplate{blocks}[default]
}{}

\BeforeBeginEnvironment{theorem}{
    \setbeamercolor{block title}{fg=black,bg=orange!50!white}
    \setbeamercolor{block body}{fg=orange, bg=orange!30!white}
}
\AfterEndEnvironment{theorem}{
 \setbeamercolor{block title}{use=structure,fg=structure.fg,bg=structure.fg!20!bg}
 \setbeamercolor{block body}{parent=normal text,use=block title,bg=block title.bg!50!bg, fg=black}
}

\BeforeBeginEnvironment{definition}{%
    \setbeamercolor{block title}{fg=black,bg=pink!50!white}
    \setbeamercolor{block body}{fg=pink, bg=pink!30!white}
}
\AfterEndEnvironment{definition}{
 \setbeamercolor{block title}{use=structure,fg=structure.fg,bg=structure.fg!20!bg}
 \setbeamercolor{block body}{parent=normal text,use=block title,bg=block title.bg!50!bg, fg=black}
}

\begin{document}
\begin{frame}
    \begin{definition}[Marmot]
        A marmot is a \emph{being}.
    \end{definition}

    \begin{theorem}[My theorem]
        The colder the winter, the longer the hibernation time. 
    \end{theorem}
    \begin{proof}[My proof]
        $t_\mathrm{hibernate}\propto T^\alpha$ with $\alpha<0$.
    \end{proof}
    \begin{example}[My example]
        \tikz{\marmot[teeth,whiskers,blush]}
    \end{example}

    \begin{block}{My block}
        A block.
    \end{block}    

\end{frame}
\end{document}