Hey, some may have mentioned this before, but the streaming video idea is sweet. The 'scanning receipts and budgeting' idea has already been done for PCs, but not for phones, I don't think.
MY IDEA: An app that allows you to use a single hi-res 'landscape' sized pic that will spread across ALL 'home screens'! I have some really short, long pics I'd LOVE to put on wallpaper! I just thought it makes sense if you can scroll across all screens so easy, why not have a big pic spread over them?