You can use template overrides and CSS to completely change the looks and design of the SCLogin module. For information on how to create your own SCLogin theme, please see our theme guide:
www.sourcecoast.com/sclogin/documentation/themes
Of course, depending on the level of customization, it may be more difficult or require someone familiar with PHP and CSS code to accomplish exactly what you're looking for.
I hope that helps get you started,
Alex