I'm Rafa, from Valencia, Spain.
Traditional festivals here are very dramatic and fabulous, unique in the world, so I imagine that your country will also have unique traditions that you can tell about.
Also about the foods. Here we have the authentic "paella", what is the typical dish of your country?
And why not talk about that special place in your city, a monument, a building, a garden or landscape...
Or if you're a handyman I would be happy with a postcard made by yourself.
I also like a funny picture postcards, or comics, or those animals so funny...
As you'll see, anything is welcome.
My albums of cards: