What about a web based power supply? Completely useless project as it stands, but it will demonstrate your knowledge of electronics in many different fields
It could incorporate a web interface to make it remotely controllable (even from another country), controlling a PIC micro at the other end to decode the instructions. This could drive a D to A converter to produce an analogue signal to modulate the feedback node on a power supply (linear or switched mode, depending on how brave you feel). All areas of electronics in one project. If you can knock up something like that and demonstrate it in an interview, forget your teacher: that will probably get you into a respectable design job