I have just seen a new SERP layout on google.de which I haven't came across before - a strip of images with right and left arrow for scrolling which is placed ABOVE the ads. Here is the screenshot:
Clicking on any image on this strip changes the search query and the SERPs below (including new set of ads), but the strip remains. Of course, this pushes organic even further down.
I saw this only on FF, where it appeared for a few searches and then later on the layout disappeared (for the same queries).