Customizing Store Layout

[dougnyc]

I need to make a store to sell clothing and I would like to change the layout on all the pages like (giannidesignsinc.com) has.

 

Once the layout has been designed, how much time and how difficult is it to change the rest of the pages?

 

And, does anyone have some sample files they could share with me?

 

Thanks,

 

- Doug