Free customizable illustrations. On this website you can search for an illustration and then choose between different styles to match your design. Once selected the illustration, you can chose the colors and show/hide different layers. You can also animate your design directly on their website and export the animation as SVG+CSS, Javascript, GIF or Video formats.

This is a great resource for fast implementation of illustrations to delight your users with colorful and user friendly representations of your product. And with some animations it will for sure bring much more eye-catching experience.