A small collection of these little things comes in handy fast, especially in games where you have creatures that you have no miniature or specific token. Say you need a force of skeletons led by a lich, but you have no lich. Instead of just using a skeleton and end up getting it confused for one of the others, drop one of these little guys in as the lich.
Likewise, if you have a group of warriors, mixed between archers and swordsmen, you can use the different colored pawns to represent these basic enemies and differentiate between said archers and swordsmen. Its great all-around.