They are simple, yet they express a clear idea. For example, the car with the cord represents a hybrid/electric car. the color scheme also works well with the theme. The blue and green seem to represent nature and harmony.
Today's freebie is a set of 49 small fat and super modern icons created and released by Vlad Cristea. All icons are pixel perfect and designed to work perfectly together so you can give a modern and refreshing look to your UI projects.