I'm a fan of making it a vent (lol) but probably won't for a very long time.
http://www.ft86club.com/forums/showthread.php?t=70815
http://www.ft86club.com/forums/showthread.php?t=71065
http://www.ft86club.com/forums/showthread.php?t=59345
If the FRS style bothered me I'd pick up a BRZ one as well, no good looking aftermarket ones popped up in my 5 seconds of googling, but I'm sure a few more people will mention alternatives.
[ame="http://www.amazon.com/Genuine-2013-Subaru-Chrome-Fender/dp/B0083VFM3S"]Amazon.com: Genuine 2013 Subaru BRZ Chrome Fender Trim: Automotive[/ame]
Edit: I
REALLY like the idea of removing them altogether as above, but that would require a bunch of filler material and a respray if I'm not mistaken? Could definitely be done DIY and a couple hundred bucks to respray and blend the paint, although you may never match a white car...