Suggesting to change the banner for important messages to something like red or orange to bring attention to urgent matters. Right now it looks like it's gonna blend into the background full of similar colors.
.. as well as perform necessary actions (code, image size etc.) to make this thing visible in case of adblock solutions used. Or, in oher words, please do not use the current banner rotating/publishing system for this banner. Yeah, it is normal to whitelist sites you like, and we all like NP, but, due some some specific ads shown @ NP, some members do block NP ads all together, so they may not see this useful banner (link).
Also - sticky thread, text link or anything similar...
Even though it's not an ad, if we make it too distracting, members could still report it to ad blockers. The usage of "ad" in ad blockers isn't strictly advertisements; it also includes anything that users deem to be unnecessarily or overly distracting that is not part of the website's primary content.