Some personal examples:
Dice forge has its way of handling dices that felt incredibly smart the first time I played it
Same for Codex Naturalis, I was impressed by the simple way they printed the cards to allow for modularity, obviously the game is a lot simpler than I thought but it gave me some interesting ideas with how to overlap cards
Or the boards in Fort that have this double layer so that you can nest your pizzas and toys in there, so cozy!
I love the little stackable camels in Camel Up! Not too mention the dice dispensing pyramid!
That is such a cute game. I played it once and found the camel-stacking to be as hilarious as it amusingly strategic.