Hello there!
If any one created invoice with a new look, please share for learning purpose.
@Kashi1, this is not an appropriate question for the forum. This is not a Liquid coding forum or a place to learn programming. No doubt, tens of thousands of custom themes have been developed. Custom theme development is the responsibility of the user. If you are developing one and have a specific problem implementing it in Manager, post the question. But asking others to do your work for you violates the rules of the forum.