The little scrolling box you are referring to is a most likely a Java Script. Go to the listing you are interested in, Click on View in your tool bar, and then click on Source. Scroll down to until you see the Java Script in the html code. You can then get an idea of what Java Script was used to create the scrolling box, then cut and paste. You may need to email the seller, to find out where the Java Script originated if there is a copyright.
On the wallpaper, many sellers create their own wall paper using PSP, Photo shop or other editing tools. There are down-loadable programs and CDs for sale with wallpaper. What kind of wall paper are you looking for? You can also find free wallpaper that you can save to your computer that is available for personal and commercial use. Search free wallpaper on Google. Note: Some sites require a link back when using their wallpaper.