Strange Pyatakov Notes

Hello. A while ago I acquired two very different Pyatakov rubles notes. Here is an image of them alongside regular ones for comparison. The strange ones are at the bottom.
 

Their size, color, and even paper is very different. I am unsure if these are meant to be modern reproductions, since these notes are not rare. I could not find anything about these oddities, anyone has any information?

The notes entry: 
N#211610
N#209006

My guess would be some kind of play money, real enough for kids, different enough for adults not to get fooled.

Just wondering if there were possibilities in those days to spend material/money on this kind of stuff.