Find a specific area of the IT/CompSci field that interests you and use that as a starting point.

For example, if you find forensics interesting, you could work on building an asset tracking system that would be used to create a chain of evidence. The db could be sorted device type (HDD, cell phone, GPS, etc.) S/N, date received, date removed from inventory, etc.

This is just an example of a project that I'm working on, but maybe it'll help you get started. The key is to find something that interests you, that way you'll remain motivated to finish it.