I have used PPX for well over a year now and found the easiest way to get a theme I like is to start with something someone else has done. To me, themes are personal. Someone else's favorite location for a button is probably not where I would put it. I recently upgraded from an iPaq to the x50v. There's a Macintosh OSX Tiger theme on the PPXThemes website,
http://www.ppxthemes.com/categories.php?cat_id=115 I started with this one and customized it for my tastes.