SSH into your iPod and go to the Theme folder then remove/replace the wallpaper pic.[qimg]http://i41.tinypic.com/qwxcnl.png[/qimg]
Custom Carrier: MakeItMine (can be found in Cydia)
Also, notice the fake 3G icon . The 3G icon replaces the WiFi icon if your connection is full.
edit: If anyone knows how to change the background so it's not the regular blue diagonal stripes, then post it here please!