Many of the marshrutkas use a little plastic board to keep the change in, to quickly be able to give just the right amount:
If you look a little closer you see that it’s actually a board for holding cigarette lighters when selling them in the stores (and this has been the case every time I have checked so far).
While I assume the marshrutka owners/drivers had other things on their minds than conserving the Earth’s resources when they decided to use these plastic boards, it’s still a good little example of clever everyday recycling! I like it.
(And it seems to serve very well as a change container.)