You know, after thinking about my post above (and receiving an email from Marc - thanks!), I realized I'm an idiot [me and Phil Mikelson]. I do know how to do the above, I just didn't remember because it wasn't something I "was" doing regularly. For those that are still in the dark...
1) Dimension Zen is the Zen Theme. That one does allow you to modify order of applications, etc.
2) Millions of great images available here, or on Seattle18's site (and others). Download an image and email it to yourself.
3) On your BB, save that image to your Pictures.
4) In pictures, select that image, click the trackwheel and select "Set as Home Screen Image".
Done. I'm back to being an idiot...