Well an amusing trick is to infuse a gin with Butterfly pea flowers to make it blue that changes color when exposed to acid (like Empress Gin)

https://www.amazon.com/gp/product/B09FDX5R6C/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

Huge bag. I only used a relatively small amount for a whole liter of Gordon's (my test batch so I used a not-awesome gin). Doesn't really impact the flavor though like you are looking for but it is a nice trick.