Shimeji-ee is a Windows desktop mascot that freely wanders and plays around the screen.
If these don't work on your computer make sure you have the latest version of Java.
The ponies My Little Pony Friendship is Magic will walk around your screen acting out scenes from the series.
scmpoo.exe was the original eSheep from Windows 3.1. This is a 64bit remake
Neko has been around since the dawn of time! Its a cat that chases the mouse, and has customizable skins and behavior.