Not yet indeed,
Future versions and plug-ins for this software would be capable of setting every aspect of colour and appearance to suit your own tastes - as you can with most operating systems. Your 'user cp' panel would be the access point.
However, until we'd spent quite a bit of time studying the impact on the server of you all having a different look and feel to the site we wouldn't be making it openly available.
<sigh>If it does happen I feel the most gastly visual thread ever coming on. Screen grabs of everyone's idea of how PPRuNe should look could put me off eating for quite a while
Rob