Here are the files affected by the look and feel update:
In theory this should have only required modding .css files and maybe .adp files. In theory.
The navigation-procs.tcl had to be modded to return a "ul" for the tabs instead of a table.
dotlrn-master.tcl was modded to return different style settings depending on whether the user is in their personal portal, a class portal or a community portal.
Reverting back to the old look, ideally, should only require reverting sloan-theme.adp to cvs version 1.5 and modding dotlrn-master.css and the style settings in dotlrn-master.tcl, but I haven't attempted it so can't be positive.