On the IPFire forum page (http://forum.ipfire.org/viewtopic.php?f=27&t=12391) I have added a theme that I mady originally for myself, but other people seem to like it, 

The original IPFire theme is nice, but I was looking for a full-width theme. As I couln't find that, I decided to see if I could make one myself, as I have a long background in webdevellopment.

I also edited the clwarn.cgi file, but as it's not actually part of the theme itself, it could possibly be overwritten by a next update?

I wanted to theme the proxy error page, but as this is located even further in the source code, I am hesitating to do this, for the same reason of loosing changes by an update. I hope this makes sense?

Stefan Schantl mentioned I should send a mail to let the devellopment team know I was working on a new theme. 

Kind regards,

Broos Gert