cool app ideas

I'm not sure if these apps would be allowed by apple, but I have a couple of cool ones in mind. I think that an app for your voicemail greeting would be cool. Ex: somebody calls you and you dont answer, you then arent able to reach them until the next day. All of this would be fixed if you could save multiply greetings and select which one to use at the current time. So if your out for a round of golf with your friends and dont want to be disturbed, you select the one that says, "Hi, im out golfing right now so please call me back in an hour or so." or, again if your in the shower, "Hi, im in the shower right now, but if you call back in 10 minutes I'll be able to answer your call. I think this would be a really cool app that i would definetly pay for.