I'm not the one who launched this black and white fashion. I think it appeared mainly to satisfy more easily the needs of the dark mode in macOS, where inverting colors could give some weird results.
The older Tango icons are still in the folder [font=courier new]src/com/eteks/sweethome3d/swing/resources /icons/tango[/font] of the source code in older versions (like here for version 6.5.2), and you can copy them in the new folder [font=courier new]src/com/eteks/sweethome3d/swing/resources/actions[/font] where icons are stored now (see here for version 6.6). As far as I remember, I didn't change the name of the existing icons but many ones were added.

In fact, it's easy to use the text menu!

Note that this text appears also in the tooltip associated to each icon of the tool bar.