This is an interesting idea from Makekind: stamped carpenters’ pencils. Simply sand off the imprint on an unfinished flat pencil, and then stamp away! (These might make good party favors and/or a party activity if your kids love art supplies like my daughter does.)
But, I wonder — as always with these types of pencils — do they get used? Certainly sketching and calligraphy benefit from flat leads. But do folks generally use carpenters’ pencils on a semi-regular basis, to account for their relative ubiquity?