I think you'll find the "default" look of a linux desktop looks like windows. This does make sense since the vast majority of new Linux users will come from the Windows community. You can re-define the look and feel! I did. In fact PCLOS comes with a an option to use a RiscOS window decoration.
Don't forget that the iconbar on the bottom was used by RiscOS before windows....so who is copying who?
The one thing that Linux has to do is tidy up its filing and hidden files. The distribution of files is as bad as anything under windows. As for hidden files, well, some of these are in the same location as the users home folder which is soooo untidy and very dangerous.