Spiffy Stores Themes
From Spiffy Stores Knowledge Base
Each theme has instructions on how to customise it on it's demo store.
Antiqua theme
The Antiqua demo site has instructions on how to change your theme colour scheme, how to add your logo to your store, and how to add products to your home page
Minimal theme
The minimal demo site has instructions on how to change images in the home page slideshow, how to add your logo, what image sizes you should use for your products, how to add the special "collections page to your store, and how to change your address details in the footer.