I made a simple black mod, which I think improves slightly on Pacific's standard...for me, simpler is always better, and I didn't like the light bleed on the edges of Pacific's standard table, which distracted from my HUD stats.
Here's what it looks like:
To implement, just right-click save the image BELOW as tableBg.jpg and copy it to:
C:\Documents and Settings\<your username>\Application Data\PacificPoker\Poker\media\Themes\Theme0\
You can also get rid of the annoying blue 888 letters by replacing the 7 "888logo_setX.png" files in that same directory with transparent files of the same name/size.