Absolutely, you can use other templates in FP2003. There are a lot out there and they are designed for use anywhere. I downloaded one just to play around with - don't know if I'll replace my current design. I just downloaded it and then opened a blank web in FP and imported the template files, then went to work adding my own data. There are some tips on genealogy web design on my site also at
http://freepages.misc.rootsweb.com/~zuber/ under the New Website Help" section.
Good Luck!