In the section where you can change the icons, if you position your cursor over the icon (the one that you click on and then it brings up a menu where you can pick which icon you'd rather use) it should tell you the icon size.
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-iPhone 3GS -Bold -Curve -Tour
-Storm (long gone) -Pearl (retired)
^^True signs of an addiction.  | 
8330 icon size 
Linear Mode
