I was trying to think of a small flat plastic tile that to hide board game reveal-tokens under to protect them from patina/wear (for something like Afrika Tähti), and 2x2 flat LEGO tiles might work? 10=1$ tho. Round or square. Could probably work for bulking up print&play military game units too. Another idea is using "fleas" from that dexterity game, but those come in different colours. Coins/dimes usually have irrelevant heraldry and revealing patina. Small slottabases usually have a lot.