Hi Tony,

re:
> Hi guys where can I recover the gray theme ... I'm interested in installing it too.

There are some moi.css files linked to here:
http://moi3d.com/forum/index.php?webtag=MOI&msg=10199.3

To install it you would put one of those in place of the standard moi.css file that is in the UI subdirectory of a MoI installation.

- Michael