If you ever wanted to have a swarm of Rubies crawling and climbing around your desktop, attacking your browser window, scaling your monitor's edges, and generally being adorable, your dream has finally been realized.

http://www.mediafire.com/?5b37euh35731f57

Download this program, extract it, and run shimeji.exe, and soon your desktop will be swarming with little bunnies! They can reproduce on their own (in two different ways), interact with your non-maximized browser window, crawl around, and more!
Right click the icon in your taskbar to bring up a menu with a few options. They'll be in Japanese so use this handy guide:
Option 1: Spawn another Ruby
Option 2: Call a meeting!
Option 3: Remove all but one Ruby
Option 4: ???
Last Option: End Program

Requires Java!

Modified from the original free to distribute program which can be found here: http://www.group-finity.com/Shimeji/
All programming credit goes to Group-Finity!