Change To Shopping Cart

I use 1Shopping Cart to sell from multiple sites. Presently, the shopping cart page is the same regardless of what site it's linked to.I want to be able to change the look of the shopping cart depending on what site the customer is purchasing [login to view URL] example. I want the shopping cart page for the site that sells carrots to be carrot themed and the shopping cart page for the site that sells potatoes to have a potato theme.I don't require a lot of customization. Being able to place site specific headers and a bit of text on the shopping cart pages would do.