Well your problem is DMOZ is built by humans. You are subject to that category's editor. If they remember your other website, they will reject it on the ground above. Submit your websites several weeks apart.
X-cart is fully customizable in look. When you install you can choice between a few different layouts (right side, left side, both sides for menu) and colors.
It is not skin itself that makes your website look different, it is how you edit the templates for the various pieces that go on the page.
Look at
http://www.thelittleguy.biz/. It has a very different look than out of the box X-cart.
or look at
http://cddream.com/xcart/customer/home.php