firstly, never try to present a project which has already been done by someone else..
if you just want a clue of what project to do here are some topics.
1: develop network packet sniffer.
2: TFTP protocol ( a small one)
3: a remote administrator.
4: a n intrusion detection system (pretty complex).
# dont use any inbuilt apps in your os.
for more details you can mail me at firstname.lastname@example.org