Make a short list of possible final projects which might interest you. For each project write a couple of sentences of specifications. You might build this on a prototype board or you might actually build the circuit, put it in a box, and take it home. The course has a budget for buying parts, however if you decide to build a 200 watt hifi amplifier, you will have to buy the parts yourself.
Possibilities:
See various books or web sites for ideas
See also Lab 9.