How about these ideas:

Builder Huts:

Builders Hut Lv1
Hitpoints: 250

Builders Hut Lv2
Hitpoints: 275
Increase Speed: 5-10%
Cost: 1000000 coins
Upgrade Time: 3 days
Available: TH7

Builders Hut Lv3
Hitpoints: 300
Increase Speed: 5-10% (over Lv2)
Cost: 2000000 coins
Upgrade Time: 5 days
Available: TH8

More than one builder can be assigned to a building, every builder added to a building will reduce total build time by 1 day each (maximum 3 builders per building)


Clan Castle:

Button to sleep/guard the troops inside (similar to hero sleep/guard button)


Clan Wars:

Button to be available for wars or not to participate


New Spell: Living Dead

Available: Spell Factory Lv3
Cost : 25000 elixir (Lv1) 30000 elixir (Lv2)
Time: 30min
The spell summon skeletons (similar to the witch) to fight, Lv1 summon 10 skeletons, Lv2 summon 20 skeletons.
Hitpoints: 35 each
Damage per second: 25
Favourite target: Defensive buildings
Ability: Can climb (jump) walls