[AZAK]

A couple of my favorites:

aspirin tablets

dandelion heads/the white puffy stage

Both are a "aim small miss small" type of target; not much doubt if you hit an aspirin tablet, and the dandelion head will only completely be gone with a direct hit to center otherwise you can see by the missing section where you hit. (Free target with feedback; however, depending on personal location can be very seasonal.)

At this point, for me, still too early for the dandies; the plants have not even started growing yet.