Add external custom themes.

Naked/beamercolorthemedark.sty

@@ -0,0 +1,18 @@
+\setbeamercolor{background canvas}{bg=black}
+\setbeamercolor{normal text}{fg=white}
+
+\setbeamercolor{alerted text}{fg=gray}
+\setbeamercolor{section in toc}{use=alerted text}
+\setbeamercolor{box title}{use=alerted text}
+
+\setbeamercolor{block title}{fg=gray}
+\setbeamercolor{block title alerted}{fg=red}
+\setbeamercolor{block title example}{use=block title}
+
+\setbeamercolor{itemize item}{fg=darkgray}
+\setbeamercolor{itemize subitem}{use=itemize item}
+\setbeamercolor{itemize subsubitem}{use=itemize item}
+
+\setbeamercolor{enumerate item}{fg=gray}
+\setbeamercolor{enumerate subitem}{use=enumerate item}
+\setbeamercolor{enumerate subsubitem}{use=enumerate item}