The title says it all... sort of.  Anyway, I use the orange icons when running Mozilla on Windows and Linux, so I wanted them on OS/2.  I converted the icons with PMView, quick and dirty.  Load them and save as OS2 ICO format.  I plan to learn the XPI way of installing them, but if you want to use them follow these steps:

1.  Backup the icons in your mozilla\chrome\icons\default directory so that you can change restore the default.
2.  Unzip moz_orange_icons.zip in to the mozilla\chrome\icons\default directory.  These will replace all the default icons so overwrite.

Here are a couple screen captures, first the icons and second the icons with some Mozilla windows open.