Apple today released updates to the Find My iPhone and Find My Friends apps. While Find My iPhone 2.0.3 features a slightly new (and iOS 7-like) design, there's also one small issue -- users are reporting that the update doesn't provide the desired functionality (locating lost Apple devices) unless you just happen to be a developer. So for the time being, if you're not a developer, don't install the update.
Find My Friends 2.1.1 also includes the ever-popular "Bug fixes and stability improvements", but doesn't appear to have gained any flat design elements.