Difficult to see the end of a cane, hence all the gizzmo's to protect eyes when you bend down to 'pull a weed' and such.
I got hold of a hundred or so 35mm film canisters. Burn/drill a hole in the lid....purrfect.
Also empty plastic bottles skillfully sliced make good bird scarers. (Already mentioned me thinks.)
All the posts sort of answer the original question.