from PyQt4 import QtCore
qgis.utils.iface.mapNavToolToolBar().setAllowedAreas(QtCore.Qt.TopToolBarArea) # Toolbar can only be "attached" to the top area
qgis.utils.iface.mapNavToolToolBar().setIconSize(QtCore.QSize(200,200)) # Adapt to your screen resolution, you just have to see the toolbar here, and move it anywhere in the screen
qgis.utils.iface.mapNavToolToolBar().setIconSize(QtCore.QSize(20,20)) #Back to normal

Traceback (most recent call last):
  Line 1, in <module>
    from PyQt4 import QtCore
ImportError: No module named PyQt4