Idea for new feature: Clan Awards!
I think it would be cool to have an awards event at the end of each season. So people who have the most won attacks, most won defenses, most loot stolen, etc., would be recognized and even offered a prize.
The prize could be anything from gems to bonus loot or other rewards. And rather than having Supercell provide the reward for us, we could have clan members pitch in a fee at the beginning of each season.
For example, each member pays a fee of 1 gem at the beginning of the season, or a certain amount of loot. Then, at the end of the season, the winner takes the pot. You could also spice things up a bit by allowing players to "bet" as much loot or gems as they want if they feel confident that they'll win the award.
I think this will add a lot of fun to the game aside from normal play and it will also lead to an increase in clan activity!