7-11s Turned Into Kwik-E-Marts for Simpsons Movie promotionThe site I linked to is full of pics from the stores that were converted. There's one in Seattle (on Denny Way, right by the Seattle Center) that got turned into one too.
edit: Just as I was posting this,
prince posted a pic of the Seattle store's new look. I wish they could keep this look (but then I'm a diehard Simpsons fan).
Go have a look!