Icons8 Developer API - 500k+ design assets, now available on-demand
Christmas Design Assets by Iconfinder - Sprinkle up your seasonal content with these festive goodies.
Canva Pro - Millions of design assets, templates and images all in one
Christmas HQ - Totally free holiday icons, images, borders and fonts
Pixelify - A new way to download and share free design assets
Iconjar - Store all your icons in one place, just a click away