I found out that you can not set Eclipse like you can with a LAF for
Java Swing app. That is passing the param when invoking Eclipse.

I do not understand the problem. If your computer is XP and you have
your display properties set to 'Windows XP' theme then Eclipse will
display with that look. I can with my machine. I don't because I run
with minimal graphics to help with overhead hence performance. I have an
older PC.

Talking about Eclipse IDE look you can build your own 'Presentation'
skin for Eclipse. I have not done it. There are two plugins now out
there now that I know about. You can find then with the links below.
Maybe they could give you information on how to build your own plugin
skins.

This is how you set the appearance after installing either of the skin
plugins mentioned or just change the current theme with one of the two
themes that are already installed.

- Select  Window \ General \ Appearance
- Select the Current Presentation dropdown list and select your
presentation.

The default Eclipse system has two presentations.. 'Default' or 'Eclipse
2.1 Presentation Style'. After selecting one of these you can select a
theme from the current theme dropdownlist.

Once you install other skins you may have more items under the
Appearance tree node that you can set.

http://www.jroller.com/page/wmitsuda/?anchor=visual_eclipse_net
http://andrei.gmxhome.de/skins/index.html