In ref to this link,
the Japanese version is a bit different from the Korean version , but you can see the matches we use at:
http://www.pagat.com/class/flower.html
(You get points for collecting ribbons of the same sort (across th emonths), and some other things which aren't explained all that well on this page.)
We have a few sets at home that we take out around every Christmas/New Year's. They're actually really heavy cards so if you do it right, they make a nice snap as you throw them at the floor. (But they're not as heavy as mahjongg tiles; I'd guess they were about 2-3 mm thick.)
You can also use these cards for divination, if I recall correctly.