I had this idea of personal gardens where you could plant special seeds that would drop in a variety of ways (quest rewards, events, exploring, etc). This would be mostly for collection sake, serving more of a decorating purpose than a functional one, but I can also imagine the garden producing drops of some kind every couple hours kind of like pets do. Nothing too valuable, again, this is mostly miscellaneous. Bugs, thorns, flowers, that kinda stuff.
The Zen Garden in the classic Plants vs. Zombies is the inspiration for this. You'd have these potted plants that you had to maintain (watering them, fertilizing, etc) and they would drop coins from time to time. I was enthralled by this when I was a kid.
Zen Garden: https://imgur.com/a/vHp3srE
