I made an elliptical galaxy drawing thingy with python, unfortunately it's difficult to convert to .exe
you'll need python to run it, but that's easy to install, (you might need numpy too).
the links to download
python:
http://www.python.org/getit/(i used the link that says Python 2.7.3 Windows Installer (Windows binary -- does not include source))
numpy:
http://sourceforge.net/projects/numpy/files/NumPy/1.7.0b1/(the second to top link; install after python)
they're both fairly easy to install and useful
attached is the actual program i made.