Inside the core there's an heart...and peoples who are doing a difficult but amazing work.
Thanks do Debian team and contributors.
About the tablet WP versions:
The two resolutions and the square format insure the compatibility with almost all kind of existing tablets.
My signature (on bottom right) is strictly not visible when you use the wp.
About the WP version:
If you need other resolutions you can download the "tablet" version and simply choose a black background color (#000000).