Hello,
There are so many shopping carts (both free and paid), we can show examples whole day. Also a person who knows what he's doing will make the OsCommerce looks like no other shopping cart, it's just a matter of design. As you may know OsCommerce is a template based system, so a good designer can do the job. A good alternative (in my opinion even better) is Joomla + virtue mart component.
Thanks,
G