I've seen this mentioned here many times and it seems very interesting from the first paragraphs of the README, but it is too ugly to be taken serious, I think.
Red letters on a darkgrey background? Totally unreadable.
Also, "post-modern communication" doesn't explain what it does at all.
I prefer my backgrounds muted, but a simple search and replace in gui.css is all it takes to change the color. What's not post-modern about a distributed, encrypted social network built on plain old email? I have nothing to sell, I'm just sharing.