With Mobile Layout add-on your desktop store version will be able to use one layout and theme style, and mobile - another layout and any style, available for this theme.
Simple add-on which adds interesting hover effect for product icons on all products list pages.
One line scroll layout is a simple add-on which creates a new layout for product list.
The Ajax Mega Menu add-on allows you to optimize the work of store site. Now your site can work faster, as menu items are loaded not at once, but only when you put a cursor on them. It greatly saves the time needed to load a page, especially if you have a big menu with lots of items.