You can make a driving robot with the steppers /DC motors. You can also have it follow you, with the Ultrasonic range sensor and you can have it grab objects with the gripper.
You can make quite a few things with a keypad and LCD, password locks, calculators, control panels, even games.
The motion sensor can come in handy for a lot of things too, just do a search for PIR projects and you are bound to find tons.
RFID tags can also be used for password locks.
The rest, you can combine with other projects. Start with one thing then add; see where you imagination takes you.