Hello,
my name is Liliana, i have over ten years of experience as a designer, and what i like most is to illustrate, that's why i like this project.
Please, visit my Freelancer portfolio https://www.freelancer.com/u/webpolis.html
to see some of the icons i made, in order to evaluate my work.
I can send you more flat icons samples, if you want to.
I use Illustrator for this kind of projects, i can deliver you the icons as vector format, and saved as any other format you may need, like JPG or transparent PNG, for example.
I found this project really enjoyable and interesting, and i would like to create 850 originals, simple and fun flat icons, like the samples on the link.
Hope we can work together, please, contact me if you want to talk about the project, or if you want to see some more of my work, or a mockup for this project.
Best regards.
Lili.