1) All Linux distros are free.
2) Every distro has screenshots on their sites.
3) All distros can be made to look exactly the same - what you see is the 'window manager'. What differs from distro to distro is the layout of the underlying system. Meanwhile, the core of the system - the kernel - is all the same (there are specific patch sets available from different people, though).
I am hoping you take it seriously, do some reading, and see how amazing Linux is.