The silver case trick is best done with outdoor heavy duty vinyl, as purchased from a local sign shop. It cost less than cans of paint from the hobby shop, and is more durable. I tried using the fancy pactra paint before going with vinyl, and the paint rubs off. Go to the local sign store, have them show you all the colors available, and go nuts. If you don't like the look, you can always peel it off, no harm done.
Photos of the powerbook are here: <a href="http://homepage.mac.com/lvmarks/PhotoAlbum11.html" target="_blank">http://homepage.mac.com/lvmarks/PhotoAlbum11.html</a>
or, you could always overclock it-
<a href="http://www.bekkoame.ne.jp/~t-imai/pbg3e3.html" target="_blank">http://www.bekkoame.ne.jp/~t-imai/pbg3e3.html</a>