I've had this idea in mind for quite some time now and I do apologise if this has been requested before.
I think a clan alliance system would be perfect for clash of clans, the alliance system would contain clans of whom want to be allied to one another. These alliances would have their own chat aside from clan and global chat; they would be able to share replays, donate and request for troops. Of course being allies this would mean they will not be able to attack one another's clan members, in which I'm sure can be implemented.
There could also be a top alliance leader board and allow clans to have sub-clans containing members who don't have much trophies, but the main clan members would still be able to help them out by donating troops and such. Adding clan alliances open's room for much more features and opportunities.




