here are 9 qt styles with these styles you can run maya…

...\maya.exe" -style styleType"
simple replace (styleType) with: plastique
gtk
cleanlooks
windows
windowsxp
windowsvista
macintosh
cde
motif

You can also create your own styles with qt (as programmer)

take a look at QT designer it is a dream for designing UI in QT
and the makers of QT made QT Designer so ther is a very good integration.

This is also a video on how to load QT UI directly in maya.

http://area.autodesk.com/blogs/stevenr/maya_2011_highlight_qt_user_interface

Great resource for MEL and Python in Maya with useful links too.

ooops that was the python wiki ,

this is the MEL one

http://mayamel.tiddlyspot.com/

I asked for a evaluation copy , but I haven;t heard form them yet.
Usually takes about a week or so to get back to me.
hopefully soon

Ciao and enjoy the festivities