I have customize two themes. To look similar to your old theme. They are not completely finish but just as and example. The first theme is called Newsflash and the second is called Totc( a fixed width version and a fluid version) Both can be selected on the theme page. I have also loaded several other themes that have not been customize so you may see how easy it is to change the look of you site to a basic theme.
 

• Under Administer link click themes
• Click radio button that says default
• Click submit and theme is changed