Super simple, really. So at the base level I use
Nova Launcher Prime. I am sure you could replicate this mostly in default Touchwiz, though? I am just quite used to Nova. I use the paid version for Unread Counts (with the Tesla Unread addon) as well as Gestures, Custom App Drawers and Icon Swipes (different action depending on whether you click or swipe an icon).
Icons, and to some extent the widgets, are
Pasty from Nate Wren. Also nabbed the paid version as I wanted allllllll the icons.
Widget look is from that Pasty set, but you'll actually need
KWGT to use them/tweak them.
I resized the date and time widget. I pared down the 5 day forecast to just a 3 day forecast and removed a few things from that widget as well.
That is basically it. The Google Searchbar is one of the 'looks' you can apply to it in Nova. Background is
Kilian Eng's 'Gunslinger's Duel'
Hope that answers your question.