[cflsystems]

All you have to do is add an extra field, then in products_t.tpl (products_list.tpl, whichever you use) and product.tpl (for 4.3.x it may be in product_details.tpl) call that extra field and place an if statement to show green or red text/image depending on the value of the field. If you search the forum for extra fields you find many post how to call it in different files and for different versions