Thank you @lavish juniper for your lovely photo of Rage as the example here!
This month, I want to go all in on bits. A lot of people like making their thing look unique. Rage is a good example, with that lovely Chaos cloak from Age of Sigmar! Other people like to swap bits around to make unique variants of their 'Mechs with fun kitbashes. And this even applies to art pieces, as you can add non-native line elements to your work to make something wholly unique to the world your piece fits into!
Be these fun, minor kitbashes, or completely overhauling the theme, let's go nuts! I am going to temporarily suspend the 80/20 rule on this post to encourage creativity, but please make sure that the core of your project is definitely relevant to the CGL page! If you want to have an UrbanMech dressed up as Elvis, make sure it is showing that almighty torso as Elvis always intended, for example. A good ratio here would probably be around 40/60, I think?