not new but whenever I have to do chores, I put bracelets on with little tags with the chore written on it. They jingle against each other and so I get a tactile and auditory reminder when I move around, a visual one when I look at my hands, and an annoying one whenever I have to use the bathroom or eat food.
Things like laundry I have to break into steps, like 1 load would be 3 bracelets, load washer, load dryer, fold.
Then when I do chores I can take them off, and the relief of removing them and being able to forget is actually a great reward.
Pretty much the same as your shelf. I prepare whatever ones I need the night before, and put them on my nightstand, so they're in my face when I wake up. Sometimes I put them on my phone or something, if my nightstand is cluttered.
I set them up the night before, and keep the pile on my nightstand. I have a drawer for all the ones I'm not using that day, and they go in no particular order.
They go in the proper place because when I finish a chore and remove the bracelet, I think of removing the bracelet as the reward. Putting it in the drawer is the last step to completing the chore, so the laundry isn't done until that bracelet is in the drawer.
So the nightstand and the drawer are the only places they should ever be, unless I'm wearing them, and the nightstand is only when I set them up for tomorrow, so really just that drawer. I also keep new tags and a pencil in there so I can make neww ones without leaving the spot.
Now I'm not perfect and I do leave them around occasionally, like forgetting them on the bathroom counter, but because I always remove them in the same sorts of places, they don't stay missing for long.