ok well after much browsing in the i touch directory i finally found an answer but it involves some time.
it involves some photoshop, ssh, and uses winterbord to implement just in case i dosnt work.
first make a logo to replace by using photoshop
>make it 1.5 inch by 2.5 or anything that could fit the screen of an itouch but be positive that its transparent except for the logo.
save the file as ( IAP-lock-graphic ) and be positive its saved as a png format.
now ssh into your itouch
( var/stash/themes.m36jxo )
Make a new file there or just skip this and go into your theme folder and create a file named ( Bundles ) if you don't already have it.
then inside Bundles create a file named ( com.apple.mobileipod)
if you dont already have one.
Finally place the file you created into the mobileipod folder you just made.
test it out and improve the design
have fun!

if you want proof see for your self.