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\usepackage{shadethm}
\definecolor{shadethmcolor}{rgb}{.95,.9,.9} % Farbe des Hintergrundes
\definecolor{shaderulecolor}{rgb}{1.0,0.0,0.0} % Farbe des Rahmens
\setlength{\shadeboxrule}{1pt} % Breite des Rahmens

\newshadetheorem{Satz}{Satz}[chapter]

\newenvironment{thm}[1][]{%
\definecolor{shadethmcolor}{rgb}{0.95,0.9,0.9}%
\definecolor{shaderulecolor}{rgb}{1.0,0.0,0.0}%
\setlength{\shadeboxrule}{1.5pt}%
\begin{Satz}[#1]\hspace*{1mm}%
}{\end{Satz}}

\newenvironment{thm2}[1][]{%
\definecolor{shadethmcolor}{rgb}{0.55,0.5,0.9}%
\definecolor{shaderulecolor}{rgb}{1.0,1.0,0.0}%
\setlength{\shadeboxrule}{1.5pt}%
\begin{Satz}[#1]\hspace*{1mm}%
}{\end{Satz}}

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\begin{thm}[Titel]
Test
\end{thm}

\begin{thm2}[Titel]
Nochmal ein Test
\end{thm2}