I made made my own version of the firefox/xulrunner forms. It resembles quite closely the ones linked to in the first post of this thread. I modified the radio- and checkbutton images.
The forms package is at
http://users.tkk.fi/~otsaloma/art/fi...widgets.tar.gz.
Read the "INSTALL" file in the package.
Screenshot:
Other form widgets that apparently work:
Winterfox
PrettyWidgets (OS X)