There are themes for WordPress from various authors that can be used for many purposes.
More flexibility for appearance and functionality with WordPress.org (self hosted). More stuff to set up compared to WordPress.com. As website owner, you are responsible for updates to software.
Here is an idea for a simple + free ecommerce theme that is designed to work with Woo Commerce in a self hosted WordPress website.
https://slocumthemes.com/wordpress-themes SIMPLE SHOP (free version)
WooCommerce also offers themes
http://www.woothemes.com/product-category/themes/