Huge fan of unsplash. Wonder if there are any high quality sites like unSplash that curate "free/public domain" illustrations/graphics??
Noun Project - http://thenounproject.com
Best one so far, http://www.freepik.com/
some 'premium stuff' in there that you'd have to pay for etc, but 99% of it's all free and there's some pretty good stuff ...
I always thought that the free stuff from vecteezy were stolen artwork, if not I'd gladly use them!
wow...I honestly have not heard that one...
I've used there stuff from time to time for years...to me, it's a great resource. little things like, say, you're designing a shield style logo or brand or something...sometimes it's nice to stop by vecteezy and see some alternate shield styles etc.... that sort of thing....
Please be aware that unlike Unsplash, many of these examples here require attribution unless you're a paying member.
My go to for simple vector graphics / icons is always flaticon.com
Really love that
I'm thinking to create one here http://illlustrations.co/
It's mostly icons but some of them are made for bigger formats and can work as illustrations (free to use): https://www.sketchappsources.com/category/icon.html