beamerのカラーテーマの，maroon版（UofC）と紫版（東北大）を作ってみました。カラーテーマのフォルダ（普通，/usr/local/share/texmf/tex/latex/beamer/themes/color/あたり）に入れて，ls -Rをすれば動くはず。
beamercolorthememaroon.sty:
% Copyright 2008 by MORITA Hatsuru
%
% This file may be distributed and/or modified
%
% 1. under the LaTeX Project Public License and/or
% 2. under the GNU Public License.
%
% See the file doc/licenses/LICENSE for more details.
\ProvidesPackageRCS $Header: /cvsroot/latex-beamer/latex-beamer/themes/color/beamercolorthememaroon.sty,v 0.9 2008/08/18 20:48:24 hatsuru Exp $
\mode
\definecolor{maroon}{RGB}{128,0,0}
\definecolor{salmon}{RGB}{255,127,80}
\definecolor{crimson}{RGB}{220,20,60}
\setbeamercolor{structure}{fg=crimson}
\setbeamercolor{palette primary}{fg=salmon,bg=maroon!70}
\setbeamercolor{palette secondary}{fg=salmon,bg=maroon!80}
\setbeamercolor{palette tertiary}{fg=salmon,bg=maroon!90}
\setbeamercolor{palette quaternary}{fg=salmon,bg=maroon}
\setbeamercolor{titlelike}{parent=palette quaternary}
\setbeamercolor{block title}{fg=salmon,bg=maroon}
\setbeamercolor{block title alerted}{use=alerted text,fg=salmon,bg=alerted text.fg!75!bg}
\setbeamercolor{block title example}{use=example text,fg=salmon,bg=example text.fg!75!bg}
\setbeamercolor{block body}{parent=normal text,use=block title,bg=block title.bg!25!bg}
\setbeamercolor{block body alerted}{parent=normal text,use=block title alerted,bg=block title alerted.bg!25!bg}
\setbeamercolor{block body example}{parent=normal text,use=block title example,bg=block title example.bg!25!bg}
\setbeamercolor{sidebar}{bg=maroon!70}
\setbeamercolor{palette sidebar primary}{fg=salmon}
\setbeamercolor{palette sidebar secondary}{fg=salmon!75}
\setbeamercolor{palette sidebar tertiary}{fg=salmon!75}
\setbeamercolor{palette sidebar quaternary}{fg=salmon}
\setbeamercolor*{separation line}{}
\setbeamercolor*{fine separation line}{}
\mode
beamercolorthemetohoku.sty:
% Copyright 2008 by MORITA Hatsuru
%
% This file may be distributed and/or modified
%
% 1. under the LaTeX Project Public License and/or
% 2. under the GNU Public License.
%
% See the file doc/licenses/LICENSE for more details.
\ProvidesPackageRCS $Header: /cvsroot/latex-beamer/latex-beamer/themes/color/beamercolorthemetohokunavy.sty,v 0.9 2008/08/18 20:48:24 hatsuru Exp $
\mode
\definecolor{tohokunavy}{RGB}{62,21,134}
\definecolor{aliceblue}{RGB}{240,248,255}
\setbeamercolor{structure}{fg=tohokunavy}
\setbeamercolor{palette primary}{fg=aliceblue,bg=tohokunavy!70}
\setbeamercolor{palette secondary}{fg=aliceblue,bg=tohokunavy!80}
\setbeamercolor{palette tertiary}{fg=aliceblue,bg=tohokunavy!90}
\setbeamercolor{palette quaternary}{fg=aliceblue,bg=tohokunavy}
\setbeamercolor{titlelike}{parent=palette quaternary}
\setbeamercolor{block title}{fg=aliceblue,bg=tohokunavy}
\setbeamercolor{block title alerted}{use=alerted text,fg=aliceblue,bg=alerted text.fg!75!bg}
\setbeamercolor{block title example}{use=example text,fg=aliceblue,bg=example text.fg!75!bg}
\setbeamercolor{block body}{parent=normal text,use=block title,bg=block title.bg!25!bg}
\setbeamercolor{block body alerted}{parent=normal text,use=block title alerted,bg=block title alerted.bg!25!bg}
\setbeamercolor{block body example}{parent=normal text,use=block title example,bg=block title example.bg!25!bg}
\setbeamercolor{sidebar}{bg=tohokunavy!70}
\setbeamercolor{palette sidebar primary}{fg=aliceblue}
\setbeamercolor{palette sidebar secondary}{fg=aliceblue!75}
\setbeamercolor{palette sidebar tertiary}{fg=aliceblue!75}
\setbeamercolor{palette sidebar quaternary}{fg=aliceblue}
\setbeamercolor*{separation line}{}
\setbeamercolor*{fine separation line}{}
\mode
