Macros for Use with Beamer

beamermacros.sty

% set slide background to a specified color
\newcommand{\setbgcol}[1]{\setbeamercolor{background canvas}{bg = #1}}

% set slide background to a specified pic
\newcommand{\setbgpic}[1]{
  \usebackgroundtemplate{
    \includegraphics[width=\paperwidth]{#1}
  }
}