Mobile Wallpaper

Was looking through posts at Otaku.fm and came across Ko Taz Boom's MacBook Touch post. The Mac rumors dont usually interest me - not until anything is officially announced.
But what I did find interesting is his wallpaper on his iPod touch ^^;
Which brings me to a question - what wallpaper do you have for your mobile device?
On my iPod Touch I have Mirai-chan and my mobile its...Mirai-chan ^^;