If you have a stack of free time and not sure how to use it, here are some projects that might interest you:
Create an Unattended Windows Setup CD/DVD
Estimated time to complete - 1-2 days (if you get it right on your first attempt).
Create a Multiboot DVD
Estimated time to complete - 1-5 days (depending on how many items you add to the DVD and on your success).
Setup IE7 to Search for MP3's
Estimated time to complete - 2-10 minutes.
Learn the Basics of Programming
Coding might sound hard - but most basic applications involve you changing the Properties and using maths. All the tutorials are on the Microsoft website, as well as countless other sites that you can find by using Google.