Looking for a pack of themes with same options, same widgets, same back-end menus, same logic

Hi,

I’m looking for a pack of very nice but simple themes that can be easily managed and customized the same way (that means: same menu options, same settings options, same back-end menus, and ideally same widgets).

I’m asking for this because I’m sure many users become confused when they see so many different configuration options when they switch form a theme to another one.

Is there any solution or theme provider you could recommend to me? (A parent/childs model would be great but this is not an obligation).

Thank you and sorry for my poor english.

Laurent