Add image, image upload, text, number, number slider, dropdown, calendar, color picker, checkbox and radio options to WooCommerce Products. Product options are much easier, more flexible and faster to use than variable products. The product options can have prices and lots of other features including option groups which all you to add groups of options to all products, product categories or products a containing key word.
Demo: http://codecanyon.net/item/product-options-for-woocommerce-wp-plugin/7973927