Well hey ,not good when you lack your own ideas at that early stage .
Anyway why not make a telephone call recorder
Much needed and not available at any price I have seen
Record calls out, date_time ,number, time_length
Record calls in , date_time,callerID,time_length
Make it something with a card memory that you plug in between outlet and phone
Make it so the data file can be read by a usb port to computer
Just design it if thats all you can do and post your work back on here for comment
That way we all get something for our effort