I've already done a style with vB3, just something simple, to increase the knowledge of the new template code. And I know it'll be destroyed with newer templates, so it's only practise.
And also, if you did read the readme in vB3 before installing you would know that the templates are going to be the most changed thing with the newer beta's or RC's of vB3. So alot of mods, styles etc. you might do now will end up being affected.