I know of a website that has lots of free theme downloads, or at least they were free the last time I went there.
www.themeworld.com
this other link is a page on their site where there are 2 BSG themes listed for download. I have them and they have some interesting things.
http://www.themeworld.com/themes/scifi2.shtml
I hope this maybe helps . . .
Ethan