We are always open to new ideas, so of course you can show your design to us. You should only realize that we have strict rules regarding simplicity and we cannot promise we will replace our design with yours.
You just made some changes to the current design and I think it looks too cluttered. Those black borders distract visitors and make the page difficult to scan with the eyes. One of our main rules is to keep the design as clean as possible. We try to never add strong borders or visual elements that could distract users and take the focus away from important areas of the page.
Guys, thanks for the work on this, but none of these designs would be interesting for Nabble at this point. Tanveer's design is somewhat better, but it would require some hours of work to improve colors and gradients, and we absolutely have no time for that. We actually don't see problems with our homepage, so we won't spend time with that for now.