why isn't possible to color folder same as a Macinthosh in Dopus,
I have a solution with a little freeware: Folder Marker (System Utilities - Shell Tools) http://www.foldermarker.com/
I WANT THIS IN MY DIRECTORY OPUS !!!!!! 
Thanks!
That is a nice little freeware tool. 
But that tools already works in Opus. 
Once Folder Marker is installed (no reboot required), it's accessible from the standard context menu. You can quickly color your folder icons from within Opus.
The new folder icon will not appear until you refresh the folder listing (the out-of-the-box default for this is to press F5).
I should clarify that Folder Marker's icons will not appear in Thumbnails mode (which makes sense since Opus uses Folder.jpg or first thumbnail inside of the folder). but the new folder icons appear in all other views.
It's not a bad feature at all though. I think it would be nice if Opus could facilitate it. But this little freeware program works very well.
Alternatively you can download the FolderColors_1.zip from http://www.pretentiousname.com/themes/index.html and colour them manually.