So i think it would be cool if we could pick from a variety of skins or themes for our troops and village such as a robotic theme, space theme, undead theme, medieval theme etc. also these should be made unlockable via. Challenges
Supercell would love to turn this into a moneymaking idea. Each skin per troop will cost 10 gems, and the entire skin set (all troops and heroes unlock the skin) will cost 150 gems (saves 30 gems). The village theme will be unlockable for 200 gems.
I understand you want the theme to be easy to unlock, but if you want it to be implemented, be sure to put it in a way that Supercell would want it :P