Thesis styles are usually very specific to your University, so it's usually not profitable to ask around for a package outside your own University. Since many Universities (in their eccentric way) still require double-spacing, you may care to refer to the relevant question. If you want to write your own, a good place to start is the University of California style, but it's not worth going to a lot of trouble. (If officials won't allow standard typographic conventions, you won't be able to produce an æsthetically pleasing document anyway!)
This question on the Web: http://www.tex.ac.uk/cgi-bin/texfaq2html?label=thesis