Using different skins & site builder
Ning To Jamroom
sure, you can use any skin you like, or clone whichever skin you like and customize it so it looks like you want it to look.
The thing is the skin designers have a lot of power to choose what is displayed on the skin and how it is displayed, so changing skin can mean having different features.
The data on the back-end and the profile functionality should remain fairly constant, but the front end features and design could be different.
That was one of the intended purposes of site builder, to allow you to setup your own skin features. Before site builder it was the skin designer who decided the layout of the lists of items, now with site builder you can choose for yourself the initial layout of the top level pages becomes less important.
Take a look at the demos to see the exact same database content laid out on the different skins:
http://demo.jamroom.net/jrNingja/mda-the-blaquesmyth
http://demo.jamroom.net/jrElastic/mda-the-blaquesmyth
The main difference in the Ningja skin is the profile index page as is shown above for elastic, and ningja. The ningja one has more than just the timeline on the top page of a profile.