WordPress repository plugin illustrations

I need graphics for a WordPress plugin I'm working on.
Illustration would need to be in this style: https://wordpress.org/plugins/wordpress-seo/

Plugin I'm working on is a free / open source. It's a 'book shelf / library'.
It's like a home library, so illustration would need to be in that style as well.

Required sizes are:
Normal Banner: banner-772x250.(jpg|png)
Normal Banner (RTL): banner-772x250-rtl.(jpg|png)
High-DPI (Retina): banner-1544x500.(jpg|png)
High-DPI (Retina RTL): banner-1544x500-rtl.(jpg|png)

Normal: icon-128x128.(png|jpg)
High-DPI (Retina): icon-256x256.(png|jpg)
SVG: icon.svg

Thank you.