eBay Motors: Subaru WRX Impreza STi Aluminum Emblem Badge Pink (item 220314620588 end time Dec-18-08 11:04:08 PST)
Along with the OEM Subaru emblem on the trunk (which looks like the following although the auction is for a front grill emblem):
eBay Motors: 2008-2009 Subaru WRX-STI grille emblem (item 270309763065 end time Dec-05-08 08:01:14 PST)
The badge setup would be something like this:
Any other suggestions out there? I wonder if I could find a pink JDM trunk budge to use instead of the blue Subaru emblem.