If you turn off stylesheets, you can even read the text.
Email jwz your suggestions. Also have you seen his homepage? http://www.jwz.org/ OMG, it's like... So horrible hurts my eyes, god who would care about what jwz says with that design!
On HN you're not a real hacker until even your tweets have a colophon.
In all seriousness, what issues do you have with it?
Reading it on my tablet at night means I don't get blinded by a light background, and the green is something my eyes deal with easily. Honestly, I think his site looks better than most of the same vanilla layouts we see here posted every day.
I'm not affiliated with the developer in any way.