\documentclass[12pt]{article}
\pagestyle{empty}
\usepackage{tikz}
\begin{document}

\begin{tikzpicture}
%\fill [blue!75, even odd rule] (0,0) ellipse (5 and 3)  ellipse (4.7 and 2.7);

\filldraw[draw=blue, fill=blue!25] (-.5,-.5)--(-5,-5)--(-.5,-5)--(-.5,-.5);
\filldraw[draw=blue, fill=blue!25] (.5,-.5)--(5,-5)--(.5,-5)--(.5,-.5);




\end{tikzpicture}
\end{document}
