I've been looking through my decks lately, and it's really hitting me how weird my deckbuilding style is. So while I don't consider myself an experienced player by any stretch of the imagination, I might have some perspectives to share.

Similar to what legendofa said, I'm a huge fan of messing with the colour pie. So, one deck I'm working on is Evra, Halcyon Witness, which most people would see as a life gain commander, I see it as a really specialized version of Hatred, but instead of "Pay X life", X is set for you. So that made me think, can I build a mono-white deck that plays like a mono-black? How many options does white have for paying life and sacrificing your own creatures? I'd like to do something similar with the other colours, like how many one-drops can I use to make a funky aggro deck?

A deck I'm still in the theorizing process for is the answer to the question "how funny would it be if I built a deck where I can't cast the commander?". Right now I'm thinking Inalla, Archmage Ritualist but build the deck in mono-blue and just go blue wizard tribal. Maybe I'd allow myself a Fellwar Stone and one card that can let me steal another player's mana rock, so that casting my commander becomes an achievement to celebrate. From there it's a balance of building a viable 99 that has a chance to win the game, while sticking to the idea that I want this deck to be funny. This was very much inspired by watching Commander at Home whenever Olivia gets incoherent from laughing so hard at her own shenanigans.

My favourite deck I've built yet, which still needs quite a bit of work, is Defile Me Daddy Rakdos. Rakdos the Defiler is the commander, and most decks I've seen with him as the commander focus on how painful it is to be hit by him, then double down on that pain. I thought, it'd be more fun if I were to lean into the politics of a commander like that. So I put in a whole bunch of cards that demand deals: Scheming Symmetry, Infernal Offering, Sower of Discord, and other effects that either say "two of us will get a very nice thing" or "two of us will get a very bad thing". I see it as forcing you to get in character, you kind of have to play like a demon to pilot this demon deck.

I've also been eyeing proliferating commanders, mostly because the lands and mana rocks that use counters of some sort are really cool. Peat Bog, Altar of Shadows and Pyramid of the Pantheon, for example. Then balance it with non-standard proliferating wincons, so instead of +1/+1 counters and infect, I've been thinking of cards like Strixhaven Stadium, or the ult on a few planeswalkers (Vraska, Scheming Gorgon immediately comes to mind).

Hope that gave you some ideas! I'm on the exact opposite journey, because I'm too good at restricting myself, and whenever I try to bring friends into the game I can't really lend them any of my decks.