We found an excellent set of free icons for use in your designs, with a great name to boot. Ballicons 2 is a universal set, that will fit perfectly any kind of project: Web, App or Print.
The icon set comes in two syles, straight flat and light gradient. Available in PSD and SVG formats, meaning you can easily resize and customise Ballicons as needed! there is even a paid for set which includes even more icons for you to use.