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Yesterday, an epoch-making module was announced by HIDETO.N.
The module is named "THEME CHANGER".
You need not any hacks.
All you have to do is installing this module and changing your theme into "z_changeable_theme" bundled in the archive.
Its novelty of the idea is preparing "a starting theme for switching".
Thus, you can change themes by each modules without hack.
download from here.
http://tms.s10.xrea.com:8080/mydownloads-singlefile-cid-1-lid-5.html
Though this is a Japanese site, the module has english files.