You might think that I'm talking about the Flags for your clan but I'm thinking about flags that you drop in the Map like for more loot bonus These can be upgraded bye your clan donateing credits to the clan.
CREDITS
how to earn Credits Maybe set a clan goal and if each person can reach the goal they each get a certain amount of credits To help the clan Upgrade there flags.
Also There will be flags for clan castle troops Upgradeing This flag stays in ur cc and has to be rearmed if your village was attacked.This will add 5%/5% attack to your cc troops will defending is better.
GOAL FOR CLANS
can be set by leader only either it be win 5 clan wars or have the clan members donate 500 Troops The lower the goal the less the Credits you earn.
This was a quick thought and idea I had but there's lots more to work out let me know what you think