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well, u can pretty much make so many projects like connect LCD and keypad and make an alphanumeric video game. Or security theft alarm (also called burglar alarm), or connect any sensor like speed measurement of a wheel in bicycle or vehicle and send data periodically to LCD or on UART. Using comparator, CCP module and timer you can create a frequency counter or detector and detect any faults or harmonic distortion etc etc.
You can think of much more if you try hard t find applications.