You don't have to put any PHP codes, it will automatically replace all gravatars on your pages into Blog Catalog's avatar even on the dashboard.

Catalog plugin with fully customizable responsive design, search and categories. Best for product catalog and services or portfolio presentation.

WooCommerce Catalog Booster lets you modify the standard layout, disable sales, transform e-commerce into simple & beautiful catalog.

Woo Product Options with Options Layout Builder

Light, powerful, easy to use and theme WordPress ecommerce / shopping cart plugin that utilizes ajax for better user experience.