In Kidzy template we used scalable vector icons: FontAwesome 4.4 and Kidzy. They can instantly be customized — size, color, drop shadow, and anything that can be done with CSS.
You will find them, as always, in font folder: templates\shaper_kidzy\fonts\
There are typography icons - so to use them right, you have to use class names. For example, classes for Kidzy font you will find here: templates/shaper_kidzy/css/kidzy-icon.css

Font Awesome & Kidzy are designed to be used with inline elements (we like the < i > tag for brevity, but using a < span > is more semantically correct). Guide how to use FontAwesome you will find in this Manual.