it depends really, sliders etc would be customize 2.0, if you want to save yourself time with figuring out where to put files you could signup to customizeapp.com and create your own theme online for you to download and apply to ipod.
to do this you go to the site, signup, I think after registration you have to confirm (its been quite a while since I registered), anyway when u login scroll down to bottom of the page on the right look for my themes, create a new one then click edit (again just going off memory here been a while since I have created a new theme from scratch), from here you can do all kinds, upload images for wallpaper, home screen icons, sliders, carrier images, battery images, themes for apps like itunes and music player.
just have a look and mess around with it