I’ve been working on this graphic in photoshop, and although I got (eventually) the thing I wanted, I’m still not clear how I got there. Use freely. To save, Right-Click and select “Save As…” or “Save Image As…” depending on your browser.
This is the chunky version (641px x 802 transparent png)
and this is the slightly more textured version.
The photoshop file is here.