Simpler, flatter icons for the iOS 7 versions of iPhoto and GarageBand have been spotted within the iCloud Storage Management section of the iOS Settings app, hinting that the apps will receive an iOS 7 makeover in the near future, possibly at Apple's iPad media event on October 22. The icons, which feature bright colors, can be seen by accessing Settings --> General --> Usage --> iCloud Manage Storage.
As noted by 9to5Mac, the icons for iCloud Storage management are handled over the air, so it is likely that the icon images were prematurely uploaded to Apple's servers. iPhoto is one of the Apple-made iOS apps that has not yet received an update for iOS 7. iBooks, iMovie, and the iWork suite of apps are also awaiting an update.
Apple could be planning to use its iPad event to display the redesigned versions of both iPhoto and GarageBand, as Apple has touted the iPad's productivity capabilities with those apps in the past.