If you are looking to add a nice set of icons to your project the IconSolid set of icons will cover all your needs. This awesome collection includes 10 different sized PNG files: 24x24, 30x30, 32x32, 36x36, 48x48, 60x60, 64x64, 128x128, 256x256, 512x512 pixels, perfect for Grid based projects.
You will be able to download also a set of vector files ( .ai and .eps ), and also you will get the entire set as a web font, and you can use the icons using @font-face.
For a very limited time you can purchase this icon set for only $19.
Purchase developer license from the following buttons
Terms and conditions - Licence
Files are delivered in PNG, SVG, AI, EPS, CSH, PSD and Web font format.
You can choose to purchase from two licenses: Royalty Free and Developer License.
Both license types are Royalty Free, so the icons can be used without attribution.
If you choose the Developer License you can use the license for both commercial and personal projects, for yourself or your clients.
The Developer license allows for usage in any personal or commercial project, including mobile and desktop applications, and for templates that will sold to direct clients without an additional licensing fees.