Unfortunately topics like this never get much attention. The only thing I can recommend is to find a topic that interests you and then just go find something that sounds neat. It doesn't have to be the next Google and it doesn't even have to make money, just do something.
For example, I've recently become fascinated with data mining. To explore this area and get a basic idea of how it works, I'm playing with the Twitter API and trying to look for neat things that can be done with the data available. One idea I've come up with is an app that recommends people to follow based on the hashtags that you use frequently. It's still a "half baked" idea for now, but maybe something good will come from it.
Good luck.
