i think it could be a good idea to add many different color themes and customize the buttons/icons on the app.
Is this for the CLZ mobile app? Or web app? (on the web-app we have light/dark/blue skins). For mobile we currently only have light/dark skin.
As for custimizing the buttons/icons in the app, what exactly would you expect there?
it can be on the Mobile app and web app
Christmas time the app skin could be Red and Green with A Missile toe icon on the back arrow.
Halloween time the app skin with Orange and black with a pumpkin icon on the back arrow
Also some other color skins for generic times like yellow and blue a space ship icon.