unDraw is a collection of about 279 svg illustrations. The collection pretty much cover most illustrations for regular use cases. The users can also take advantage of the on-the-fly color image generation to match whatever project they are working on.
Here is a image that matches my current webpage theme colors:

All the illustrations are MIT licensed, so you have all the freedom to do whatever you wish to do with the illustrations. Many thanks to Katerina Limpitsouni, Aggelos Gesoulis and ShareBoost for bringing this together.