write a script that automates an administrative job for network and  system administrators
Examples of simple projects (as guidance):

Scripts for to read users information from a list or data base and  create user accounts in the systems
Scripts to monitor the performance of the system and prepare a report  for the administrator
Scripts for sending messages over the network to users about specific  maintenance action such as system reboot or so.
Scripts for ping sweepings and port scanning
Scripts for system enumeration
Scripts for analyzing network traffic  

My Preferred topic
Automated Vulnerability Scanning Script
Automated Disaster Recovery Script