Russ I see you have also posted this question in Scripting
under Advanced Guestbookss.
That is the place for your question.
So I will lock this post, so all your answers will be in one place.
You do not say which guestbook you have installed,
but if it is the Advanced Guestbook, yes can make it fit in with your look.
login as the admin and play with the styles (page colors)
If you understand html, you can change the html templates, Give write permissions to the webserver on the template files!
Generally the styes will do the trick.
For anyone else wishing to restore a database through
phpMyAdmin in cpanel,
Select the database on the left,
Click on SQL,
in the window at the bottom
Or Location of the textfile :
browse to the backup on your computer,
select go, and give it time.