Croatia is a beautiful country bordering Adriatic sea and visited by around 20 million tourists each year. At the moment it is represented by just one location stamp, but I think there is a big potential there.
Croatian currency is called kuna (meaning "marten"), referring to the historical use of marten pelts as units of value in medieval trading. Kuna will be replaced by Euro next year, so now is the perfect time to roll out the stamp.
In the Middle Ages, marten pelts were highly valued goods used as a form of payment in Slavonia, the Croatian Littoral, and Dalmatia. The banovac, a coin struck and used between 1235 and 1384, included the image of a marten. This is one of the reasons why the Croatian word for marten, kuna, is the name of the modern Croatian currency. A marten is depicted on the obverse of the 1-, 2-, and 5-kuna coins, minted since 1993, and on the reverse of the 25-kuna commemorative coins.
A running marten is shown on the coat of arms of Slavonia and subsequently on the modern design of the coat of arms of Croatia. The official seal of the Croatian Sabor (parliament) from 1497 until the late 18th century had a similar design.
Martens have already been featured on numerous postage stamps around the world - now it's Slowly's turn. :)