This image
is used as a background in various places around the site. While I appreciate the idea, in practice it makes reading black text a bit of an eye-straining task.
For instance, notice the background behind the description on
my profile page.
I like what the "Recent Forum Posts" section does: use this image as the background, but put foreground text in a white < div > rather than a transparent one to give the text solid contrast and keep readability at its best.