Ajeh, you rock! I added the code as you described, then used my Firefox Web Developer Tools to pinpoint DIV and class names on the shipping estimator. I created a couple images, added some CSS code and the layout is tons better! Visually, the two separate carrier types are easy to identify and easy on the eyes.
Thanks so much. For anyone else, here's the CSS I used along with a snapshot of the finished and working modification:
Code:
#shippingEstimatorContent .fedexwebservices { background-color:#cdbca9; background-image:url(/images/fedex-mini.png); background-position:center right; background-repeat:no-repeat}
#shippingEstimatorContent .ups { background-color:#e7c69f; background-image:url(/images/UPS-mini.png); background-position:center right; background-repeat:no-repeat}