What got me thinking on this topic again was I got a new cover, for A Hint of Frost, and I LOVE it. Like I am absolutely madly in love with it and want to paste it everywhere. So I redesigned my Facebook pages to show off my new pretty.
This is how my standard page looks:
This is how my fan page looks:
And this is how my landing or welcome page looks:
Banner (long picture, left hand side):
Banner (five pictures across page top):
Landing page (Only for use on fan pages):
You'll need some sort of graphics software to manipulate these templates. GIMP is one free option. Another is Aviary. You may even be able to use Paint.Net to meet your needs.