Copyright © 2008, 2009 Arndt Roger Schneider
Graphical User Interface Fashions existed from the very start.
The first fashion as such is the Pseudo-3D Interface. Motif and thus Tk are examples for Pseudo-3D. Pseudo-3D is characterized by a dominant gray background. Borders imitate raised oder sunken objects (Pseudo-3D), and usually have a rectangular shapes.
With the tremendous increase in graphical processing power a new kind of graphical quality becomes possible. X11 was excluded from this graphical abundance till XRender appeared.
The current trend can be summed up as follows:
No trend can be deduced for Combobox, Tabset, Spreadsheet, Hierarchy and Scrollbar.
Clearlooks is a good example for the current trends. iTunes® also exhibit these trends; see "Settings for Party-Shuffle" for example.