Tip: in admin->tools->developers tool kit, you can look for phrases like "shopping cart".
In includes/languages/YOUR_TEMPLATE/english.php, look for
Code:
Line #108 : define('BOX_HEADING_SHOPPING_CART', 'Shopping Cart');
Line #480 : // shopping cart errors
Line #482 : define('ERROR_PRODUCT_STATUS_SHOPPING_CART','<br />We are sorry but this product has been removed from our inventory at this time.<br />This item has been removed from your shopping cart.');
Line #492 : define('WARNING_SHOPPING_CART_COMBINED', 'NOTICE: For your convenience, your current shopping cart has been combined with your shopping cart from your last visit. Please review your shopping cart before checking out.');
Line #560 : define('EMPTY_CART_TEXT_NO_QUOTE', 'Whoops! Your session has expired ... Please update your shopping cart for Shipping Quote ...');
The line numbers won't be in the file, but if you use a text editor like Crimson Editor, it'll show you the line numbers. Of course you can just search for the phrase. Replace it with "jewelry box". Be careful not to replace SHOPPING_CART.
I'll have to look around for the image information, but someone else may jump in before I have a chance.
Shopping cart appears other places as well (like includes/languages/english/YOUR_TEMPLATE/shopping_cart.php). Use the tool kit to find them.