Selection of a final year project of computer engineering?

I'm a computer engineering final year student. I'm really confused about my final year project. I'm good in programming and i want to do a type of project that has some real worth in market can anyone help me out? I should develop an android app an iPhone or windows 8 app?

I would suggest either an Apple or android app. Windows 8 hasn't caught on very fast. If you do an Apple app, it will have to be approved by Apple and then it will be on the App Store, the largest app store. On android, however, there are less restrictions, but an app could be lost in search results due to a lack of quality control.