WooCommerce Variation Swatches Plugin
Here is another WooCommerce plugin that lets you make your site more good looking. WooCommerce Variation Swatches turns dropdowns into good looking swatches. It supports color, image, and label swatches. You can add multiple gallery images for each variation and adjust swatch height/width/font/colors and other settings.
Variation Swatches for WooCommerce can automatically convert dropdowns to label swatches. It has 3 styles for you to choose from (square, circle, rounded). In addition to Swatch width/height/alignment, you can also customize various tooltip settings.
XplodedThemes is the coder behind this commercial plugin. You can find out more about it here.