Just rounds off of a branch cut with a razor saw and drilled. Real quick and simple to make and given that they go for $1.50 and up each if you buy the darn things are a decent ROI on your time. The boss wanted some for one of her projects, this isn't quite a lifetime supply but close. Made about 100 in a bit over an afternoon.
Front to back: rosemary (nicer than expected cut dry), basswood (cut green) and lilac (imho the nicest in person cut green).
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Apologies to Mr Weaver for the egregious display of end grain