You can give your iPod a background, and custom graphics using iPod Wizard.
I can make themes if anyone wants....

here is one....

it contains images from:
Coldplay, Feist, The Shins, Steve Burns, Death Cab For Cutie, Patrick Wolf, Xiu Xiu, The Arcade Fire, Bright Eyes, Editors, Interpol, Modest Mouse, Of Montreal, Pink Floyd, Xihilisk, and !!!

Image Preview

Download it!

How to use:
Unzip the rar file,
Open iPod Wizard,
Select iPod from the dropdown box,
Press load iPod frimware,
press the load all button,
select the folder with the extracted images,
Then when it is done, press write

P.S. Make sure your iPod is in disk mode when this is being done....and I suggest you do it after your warrenty is over, because I think this voids it...
P.P.S. I think this may only work for 5.5G iPods....for other models, check out themes on the iPod Wizard Website

other than that, enoy!