Restoring an Iphone ( Front and Back)

My previous iPhone was stolen at the gym, low on funds I decided to buy the cheapest iPhone I could find that worked regardless of condition. I found an iPhone 3G that had being completely abused and had a dark spot on the LCD. On the second picture notice the gouge on the right side, out of of all the blemishes it was the deepest) Still I ended up buying the phone for a really good price