Please do not re-surrect years old topics like this. If you are interested in customisation, look at the pinned topics, which include an Index full of useful tips and info on this art.
Moreover, this is an AFOL's community, and we require a certain maturity in our members, so please check your capitalisation before posting. Thank you.
Now, to answer your questions: Bobskink uses Sculpey to make customs like this. You can find a tutorial on how to use this kind of plastic 'clays' by tin7_creations at this link.