As a designer turned developer, some tools are relevant to both and need to stay sharp in the toolbox. One of those tools I have found are the use of vector graphics. There are several types of vector graphics used frequently within web design and development including illustrations, icons, and even animations. I have collected this list by category of some of my favorite (and generally free) resources for vectors. Hopefully this list provides you with some additional tools for your own toolbox to keep your designs and skillset sharp.
These platforms have a wide variety of fun and customizable set of illustrations you may find useful for your project. They can be used for things such as splash page images, hero images, or even on your 404 page!.
Icons can be used for a variety of things across a web application and its nice to keep your project's icon set fresh. This list provides you a TON of free and easily customizable icons to use throughout your project.
*Honorable Mention (because of it's free option!): Shape.so
With the right box of sharpened tools, we all can produce more beautiful, more powerful, and more effective work. One of the tools you should include in your dev toolbox is the resources for finding beautiful and customizable vector graphics. I hope you find some value in the above resources, and are able to pick and choose a few of your own favorites to sharpen this fun and important tool in your box.