Ever wanted to spice up your windows? Well, you have always been able to! Here's a site where you can get all your favorite cursors from~ link
As for themes, it can be found from the same site too! Note that however, for Vista and Seven users, you have to patch your system before being able to theme it. =) I recommend using this program to help you patch your system in one click! Link
Cheers to customizing Windows to your liking!