Custom Subpages Needed

So my basic idea is to have a home page design, page-front.tpl in this case, and then several sub pages. By sub page, I mean that there can be an intermittent page inbetween the page, and the typical "page" content. This sub page will have the ability to route to other sub pages, but primarily route to basic content pages. It sounds like Drupal is fit for this, as it is simply an additional layer before content is displayed, but I cannot find a good module that will handle this feature. Would this be manual module development, or can anyone think of a module that will suit. The key here is that the sub pages will have their own characteristics in CSS. Maybe some color changes in font ect. There will not be any heavy layout changes amongst them.

Any help would be greatly appreciated!