Think before you drink

This goes for all of you who have wooden tables without any protective surface treatment. As soon as you put your glass on the table, there is an ugly ring. We found fifities' style coasters in Stockholm. There is a blue fish (in picture), a yellow onion, a red beetroot and a green herb. We should have bought two packages to get two of each! I don't think these can be found in Finland. Let me know, if you see them somewhere (or even better, buy me a package).