I had a look at the windows 8 app development resources and there are always this fency layouts with different templated items (see below) but I could not find a sample how this should be done.

Does anyone have a sample or even know how to do it?
update
Maybe the question is a little bit to unclear.
I want to know how the designs you can see in all the Windows 8 demo apps and in the image above are done. For example often there are different headlines (friends, restaurants, wishlist,…) with lists below. This lists contain sometimes images that are, lets say 10×10, and others are 20×10 (see 3 col in the image). Is there a build in and easy way to achieve this or do they just stack lists and templates (using stackpanels and such things) somehow?
I have found something in the documentation of the developmentcenter:
http://msdn.microsoft.com/en-US/library/windows/apps/xaml/hh465351
There is a control called “VariableSizedWrapGrid” which handle this layouts!
http://msdn.microsoft.com/en-US/library/windows/apps/xaml/windows.ui.xaml.controls.variablesizedwrapgrid