I think it is cool that you can swap out belt buckles and that there are so many cool ones out there. Really lets you dial in a fit and add a bit of flair, like an informal version of a pocket square.
Tell me about your favorite belts, buckles, and related stuff.
Pic is an incolay belt buckle, they are cheap as dirt on ebay but have a great texture and the blue/white ones like in the picture go great with any denim.