DRI3000

On my Nexus 7, the actual screen is larger than apps can paint to - some of the screen is reserved to the three soft buttons (back/home/app switcher). They could use this area to show the app logo in this area (at least when there is a password input prompt) to make sure users know what app is asking for password.

App store would still need to check that nobody is uploading apps with deceptive icons...