Y'know what? There is a really great site i found a while ago:

http://burogublog.wordpress.com/2008/06/29/lucky-star-pc-goodies-and-downloads/

And then you may ask: what's with it? Well, there's some things from that site you really should download like:

*Lucky Star Accessory CD
It has some great sound for your computer and you can put them anywhere you want! The best one's the email tune with Konata or starting theme with Kagami.
Download here: http://www.megaupload.com/?d=1B685ZCU

*Lucky Star Okiraku Box
The game doesn't really work except you have something strange but it comes with screensavers! As I can't install...
Download here http://www.megaupload.com/?d=2PIO6N7Q

*Desktop Mascot
It's really funny ones in that one XD you can use part one to place moving stuff onto your screen and you can use part two for games/clock ect on the screen.
Download part 1 here: lucky_star_desktop.rar
And 2 here: kfbox.zip

(To use any of the box you have to install 7-zip and use it to open the files then drag them to your documents)